moved notice to paragraph under stream_writers

Signed-off-by: creme <creme@envs.net>

changelog.d/12196.doc

@@ -1 +1 @@
-Document stream writer `to_device`, `account_data`, `receipts`, and `presence` can only be used on a single worker.
+Document stream writer `typing`, `to_device`, `account_data`, `receipts`, and `presence` can only be used on a single worker.

docs/workers.md

@@ -368,6 +368,9 @@ Some of the streams have associated endpoints which, for maximum efficiency, sho
 be routed to the workers handling that stream. See below for the currently supported
 streams and the endpoints associated with them:
 
+unless otherwise documented, stream_writers can only be used by a single worker
+instance.
+
 ##### The `events` stream
 
 The `events` stream also experimentally supports having multiple writers, where
@@ -384,38 +387,38 @@ stream_writers:
 
 ##### The `typing` stream
 
-The following endpoints should be routed directly to a single worker configured
-as stream writers for the `typing` stream:
+The following endpoints should be routed directly to the worker configured as
+stream writers for the `typing` stream:
 
     ^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/typing
 
 ##### The `to_device` stream
 
-The following endpoints should be routed directly to a single worker configured
-as stream writers for the `to_device` stream:
+The following endpoints should be routed directly to the worker configured as
+stream writers for the `to_device` stream:
 
     ^/_matrix/client/(api/v1|r0|v3|unstable)/sendToDevice/
 
 ##### The `account_data` stream
 
-The following endpoints should be routed directly to a single worker configured
-as stream writers for the `account_data` stream:
+The following endpoints should be routed directly to the worker configured as
+stream writers for the `account_data` stream:
 
     ^/_matrix/client/(api/v1|r0|v3|unstable)/.*/tags
     ^/_matrix/client/(api/v1|r0|v3|unstable)/.*/account_data
 
 ##### The `receipts` stream
 
-The following endpoints should be routed directly to a single worker configured
-as stream writers for the `receipts` stream:
+The following endpoints should be routed directly to the worker configured as
+stream writers for the `receipts` stream:
 
     ^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/receipt
     ^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/read_markers
 
 ##### The `presence` stream
 
-The following endpoints should be routed directly to a single worker configured
-as stream writers for the `presence` stream:
+The following endpoints should be routed directly to the worker configured as
+stream writers for the `presence` stream:
 
     ^/_matrix/client/(api/v1|r0|v3|unstable)/presence/