apply changeset documentation fixes

Co-authored-by: Maria Elisabeth Schreiber <maria.schreiber@apollographql.com>

.changesets/config_apollo_sig_ref_default_mode.md

@@ -1,5 +1,5 @@
-### Set Apollo metrics generation mode to new by default  ([PR #5265](https://github.com/apollographql/router/pull/5265))
+### Set Apollo metrics generation mode to `new` by default  ([PR #5265](https://github.com/apollographql/router/pull/5265))
 
-Changes the default value of experimental_apollo_metrics_generation_mode to be new since all metrics are showing that identical signatures are references are being generated.
+Changes the default value of `experimental_apollo_metrics_generation_mode` to `new`. All metrics are showing that identical signatures are being generated in this mode.
 
 By [@bonnici](https://github.com/bonnici) in https://github.com/apollographql/router/pull/5265

.changesets/config_bnjjj_fix_studio_selector.md

@@ -1,6 +1,6 @@
-### Rename the telemetry selector to get studio operation id ([PR #5337](https://github.com/apollographql/router/pull/5337))
+### Rename trace telemetry selector ([PR #5337](https://github.com/apollographql/router/pull/5337))
 
-We introduced a new `trace_id` selector format in `1.48.0` which has been misnamed because it's not a trace id but the Apollo Studio Operation ID. If you want to access to this selector, here is an example:
+[v1.48.0](https://github.com/apollographql/router/releases/tag/v1.48.0) introduced the `apollo` `trace_id` selector. `trace_id` is a misnomer for this metric, since the selector actually represents a GraphOS Studio operation ID. To access this selector, use `studio_operation_id`:
 
 ```yaml
 telemetry:

.changesets/docs_maria_frontmatter_update.md

@@ -1,5 +1,5 @@
 ### Update docs frontmatter for consistency and discoverability ([PR #5164](https://github.com/apollographql/router/pull/5164))
 
-In router documentation, page titles are edited to have title casing, and page subtitles and meta descriptions are updated for better discoverability.
+Makes title case consistent for page titles and adds subtitles and meta-descriptions are updated for better discoverability.
 
 By [@Meschreiber](https://github.com/@Meschreiber) in https://github.com/apollographql/router/pull/5164

.changesets/feat_bnjjj_feat_otel_name_attribute.md

@@ -1,8 +1,8 @@
 ### Override tracing span names using custom span selectors ([Issue #5261](https://github.com/apollographql/router/issues/5261))
 
-It gives you the ability to override the span name by using custom telemetry with any [selectors](https://www.apollographql.com/docs/router/configuration/telemetry/instrumentation/selectors/) you want just by setting the `otel.name` attribute.
+Adds the ability to override span names by setting the `otel.name` attribute on any custom telemetry [selectors](https://www.apollographql.com/docs/router/configuration/telemetry/instrumentation/selectors/) .
 
-Example:
+This example changes the span name to `router`:
 
 ```yaml
 telemetry:

.changesets/feat_feature_shaika_add_ms_support_to_rhai_engine.md

@@ -1,4 +1,10 @@
-### Support unix_ms_now in rhai engine ([Issue #5182](https://github.com/apollographql/router/issues/5182))
+### Add support for `unix_ms_now` in Rhai customizations ([Issue #5182](https://github.com/apollographql/router/issues/5182))
 
+Rhai customizations can now use the `unix_ms_now()` function to obtain the current Unix timestamp in milliseconds since the Unix epoch. 
 
-By [@shaikatzz](https://github.com/shaikatzz) in https://github.com/apollographql/router/pull/5181
+For example:
+
+```rhai
+fn supergraph_service(service) {
+    let now = unix_ms_now();
+}

.changesets/feat_pq_warmup.md

@@ -1,6 +1,6 @@
 ### Warm query plan cache using persisted queries on startup ([Issue #5334](https://github.com/apollographql/router/issues/5334))
 
-This adds support for the router to use [persisted queries](https://www.apollographql.com/docs/graphos/operations/persisted-queries/) to warm the query plan cache upon startup using a new `experimental_prewarm_query_plan_cache` configuration option under `persisted_queries`.
+Adds support for the router to use [persisted queries](https://www.apollographql.com/docs/graphos/operations/persisted-queries/) to warm the query plan cache upon startup using a new `experimental_prewarm_query_plan_cache` configuration option under `persisted_queries`.
 
 To enable:
 

.changesets/feat_timbotnik_experimental_studio_otlp_tracing.md

@@ -5,11 +5,11 @@ tracing system to use an OTel-based protocol.
 
 In the short-term, benefits include:
 
-- A comprehensive way to visualize the Router execution path in Studio.
+- A comprehensive way to visualize the router execution path in GraphOS Studio.
 - Additional spans that were previously not included in Studio traces, such as query parsing, planning, execution, and more.
-- Additional metadata such as subgraph fetch details, Router idle / busy timing, and more.
+- Additional metadata such as subgraph fetch details, router idle / busy timing, and more.
 
-Long-term, we see this as a strategic enhancement to consolidate these 2 disparate tracing systems.  
+Long-term, we see this as a strategic enhancement to consolidate these two disparate tracing systems.  
 This will pave the way for future enhancements to more easily plug into the Studio trace visualizer.
 
 #### Configuration

.changesets/fix_bnjjj_fix_5173.md

@@ -1,6 +1,6 @@
-### Metrics overflow is logged as a warning rather than error ([Issue #5173](https://github.com/apollographql/router/issues/5173))
+### Log metrics overflow as a warning rather than an error ([Issue #5173](https://github.com/apollographql/router/issues/5173))
 
-If a metric has too high a cardinality the following warning will be displayed as a warning instead of an errorl:
+If a metric has too high a cardinality, the following is displayed as a warning instead of an error:
 
 `OpenTelemetry metric error occurred: Metrics error: Warning: Maximum data points for metric stream exceeded/ Entry added to overflow`
 

.changesets/fix_bnjjj_fix_selector_context.md

@@ -1,4 +1,4 @@
-### Add support of response_context selector when it's in error ([PR #5288](https://github.com/apollographql/router/pull/5288))
+### Add support of `response_context selector` when in errors ([PR #5288](https://github.com/apollographql/router/pull/5288))
 
 Provides the ability to configure custom instruments. For example:
 
@@ -14,7 +14,4 @@ http.server.request.timeout:
   condition:
     eq:
     - "request timed out"
-    - error: reason
-```
-
-By [@bnjjj](https://github.com/bnjjj) in https://github.com/apollographql/router/pull/5288
+    - error: reason

.changesets/fix_bnjjj_fix_subscription_metrics.md

@@ -1,5 +1,5 @@
-### `apollo_router_opened_subscriptions` counter was inaccurate ([PR #5363](https://github.com/apollographql/router/pull/5363))
+### Inaccurate `apollo_router_opened_subscriptions` counter ([PR #5363](https://github.com/apollographql/router/pull/5363))
 
-The counter `apollo_router_opened_subscriptions` was only incrementing and never decrementing. Now it's handled properly.
+Fixes the `apollo_router_opened_subscriptions` counter which previously only incremented. The counter now also decrements.
 
 By [@bnjjj](https://github.com/bnjjj) in https://github.com/apollographql/router/pull/5363

.changesets/fix_bryn_demand_control_formatting_hot_path.md

@@ -1,5 +1,5 @@
 ### Prevent formatting in hot path ([PR #5405](https://github.com/apollographql/router/pull/5405))
 
-This PR removed unneeded formatting in the hot path for demand control. Improving performance.
+Removes unneeded formatting in the hot path for demand control to improve performance.
 
 By [@BrynCooke](https://github.com/BrynCooke) in https://github.com/apollographql/router/pull/5405

.changesets/fix_bryn_optimize_graphq_instruments.md

@@ -1,7 +1,6 @@
-### Optimize graphql instruments ([PR #5375](https://github.com/apollographql/router/pull/5375))
 
-When processing selectors for graphql instruments we need to make sure we perform no heap allocation otherwise performance is affected.
+### Optimize GraphQL instruments ([PR #5375](https://github.com/apollographql/router/pull/5375))
 
-This PR removes Vec allocations that were being performed on every field yielding a significant improvement in performance. 
+When processing selectors for GraphQL instruments, heap allocations should be avoided for optimal performance. This change removes Vec allocations that were previously performed per field, yielding significant performance improvements.
 
 By [@BrynCooke](https://github.com/BrynCooke) in https://github.com/apollographql/router/pull/5375

.changesets/fix_fix_content_type_error.md

@@ -1,6 +1,6 @@
 ### Improve error message produced when subgraphs responses don't include an expected `content-type` header value ([Issue #5359](https://github.com/apollographql/router/issues/5359))
 
-To improve a common debuggability challenge when a subgraph response doesn't contain an expected `content-type` header value, the error message produced will include additional details about the error.
+To enhance debuggability when a subgraph response lacks an expected `content-type` header value, the error message now includes additional details.
 
 Examples:
 

.changesets/fix_geal_schema_hash.md

@@ -1,4 +1,4 @@
-### do not hash the entire schema on every query plan cache lookup ([PR #5374](https://github.com/apollographql/router/pull/5374))
+### Skip hashing the entire schema on every query plan cache lookup ([PR #5374](https://github.com/apollographql/router/pull/5374))
 
 This fixes performance issues when looking up query plans for large schemas.
 

.changesets/maint_bryn_disable_tests_apollo_key_missing.md

@@ -1,6 +1,6 @@
-### Disable GraphOS tests when apollo key not present ([PR #5362](https://github.com/apollographql/router/pull/5362))
+### Skip GraphOS tests when Apollo key not present ([PR #5362](https://github.com/apollographql/router/pull/5362))
 
-A number of tests require APOLLO_KEY and APOLLO_GRAPH_REF to be present to execute successfully.
+Some tests require `APOLLO_KEY` and `APOLLO_GRAPH_REF` to execute successfully.
 These are now skipped if these env variables are not present.
 
 By [@BrynCooke](https://github.com/BrynCooke) in https://github.com/apollographql/router/pull/5362