[docs] add status header for ballast/zpages (open-telemetry#5435)

Fixes open-telemetry#5375
Fixes open-telemetry#5429
Fixes open-telemetry#5428

extension/ballastextension/README.md

@@ -1,5 +1,10 @@
 # Memory Ballast
 
+| Status                   |                   |
+| ------------------------ | ----------------- |
+| Stability                | [beta]            |
+| Distributions            | [core], [contrib] |
+
 Memory Ballast extension enables applications to configure memory ballast for the process. For more details see:
 - [Go memory ballast blogpost](https://web.archive.org/web/20210929130001/https://blog.twitch.tv/en/2019/04/10/go-memory-ballast-how-i-learnt-to-stop-worrying-and-love-the-heap-26c2462549a2/)
 - [Golang issue related to this](https://github.com/golang/go/issues/23044)
@@ -41,3 +46,7 @@ extensions:
   memory_ballast:
     size_in_percentage: 20
 ```
+
+[beta]: https://github.com/open-telemetry/opentelemetry-collector-contrib#beta
+[contrib]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol-contrib
+[core]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol

extension/zpagesextension/README.md

@@ -1,5 +1,10 @@
 # zPages
 
+| Status                   |                   |
+| ------------------------ | ----------------- |
+| Stability                | [beta]            |
+| Distributions            | [core], [contrib] |
+
 Enables an extension that serves zPages, an HTTP endpoint that provides live
 data for debugging different components that were properly instrumented for such.
 All core exporters and receivers provide some zPage instrumentation.
@@ -70,5 +75,6 @@ that are properly instrumented. For example when using gRPC
 
 Example URL: http://localhost:55679/debug/rpcz
 
-
-
+[beta]: https://github.com/open-telemetry/opentelemetry-collector-contrib#beta
+[contrib]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol-contrib
+[core]: https://github.com/open-telemetry/opentelemetry-collector-releases/tree/main/distributions/otelcol