chore: update changelog for v2.4.0 (#10158)

Author: devbww

CHANGELOG.md

@@ -116,7 +116,7 @@ may elicit a deprecation warning. See [#9086] for more details.
 
 </details>
 
-## v2.4.0 - TBD
+## v2.4.0 - 2022-11
 
 ### New Libraries
 
@@ -131,6 +131,57 @@ In addition, these existing libraries are now GA:
 
 - [Cloud Batch](/google/cloud/batch/README.md)
 
+### [BigQuery](/google/cloud/bigquery/README.md)
+
+- doc: add endpoint override snippets to generated libs ([#10129](https://github.com/googleapis/google-cloud-cpp/pull/10129))
+- feat(bigquery): add migration service ([#10034](https://github.com/googleapis/google-cloud-cpp/pull/10034))
+
+### [Bigtable](/google/cloud/bigtable/README.md)
+
+- doc(bigtable): add `*Client` samples ([#10149](https://github.com/googleapis/google-cloud-cpp/pull/10149))
+- feat(bigtable): support `GOOGLE_CLOUD_ENABLE_DIRECT_PATH` ([#9978](https://github.com/googleapis/google-cloud-cpp/pull/9978))
+
+### [IAM](/google/cloud/iam/README.md)
+
+- doc: add endpoint override snippets to generated libs ([#10129](https://github.com/googleapis/google-cloud-cpp/pull/10129))
+
+### [Pub/Sub](/google/cloud/pubsub/README.md)
+
+- doc(pubsub): samples for endpoint and auth ([#10136](https://github.com/googleapis/google-cloud-cpp/pull/10136))
+- feat(pubsub): install pubsub_mocks pkg ([#10008](https://github.com/googleapis/google-cloud-cpp/pull/10008))
+- feat(pubsub): implement blocking publisher ([#10055](https://github.com/googleapis/google-cloud-cpp/pull/10055))
+- feat(pubsub): implement per-call options for `Subscriber` ([#10043](https://github.com/googleapis/google-cloud-cpp/pull/10043))
+- fix(pubsub): limit `ModifyAckDeadlineRequest` size ([#10032](https://github.com/googleapis/google-cloud-cpp/pull/10032))
+- fix(pubsub): faster shutdowns for `Publisher` ([#9991](https://github.com/googleapis/google-cloud-cpp/pull/9991))
+
+### [Spanner](/google/cloud/spanner/README.md)
+
+- doc(spanner): add `*Client` samples ([#10145](https://github.com/googleapis/google-cloud-cpp/pull/10145))
+- feat(spanner): add support for RowStream::RowsModified() ([#10102](https://github.com/googleapis/google-cloud-cpp/pull/10102))
+- feat(spanner): support for the PG.JSONB data type ([#10098](https://github.com/googleapis/google-cloud-cpp/pull/10098))
+
+### [Storage](/google/cloud/storage/README.md)
+
+- doc(storage): common initialization examples ([#10107](https://github.com/googleapis/google-cloud-cpp/pull/10107))
+- fix(rest): too many debug headers ([#10054](https://github.com/googleapis/google-cloud-cpp/pull/10054))
+- fix(rest): return complete payloads for errors ([#10051](https://github.com/googleapis/google-cloud-cpp/pull/10051))
+- feat(storage): support `Autoclass` feature ([#10003](https://github.com/googleapis/google-cloud-cpp/pull/10003))
+- feat(storage): faster `InsertObject()` uploads ([#9997](https://github.com/googleapis/google-cloud-cpp/pull/9997))
+- fix(storage): respect MIME message boundary size limits ([#9965](https://github.com/googleapis/google-cloud-cpp/pull/9965))
+
+### [Common Libraries](/google/cloud/README.md)
+
+- feat(generator): generate authentication example ([#10138](https://github.com/googleapis/google-cloud-cpp/pull/10138))
+- doc: workaround Doxygen formatting quirk ([#10137](https://github.com/googleapis/google-cloud-cpp/pull/10137))
+- doc: add endpoint override snippets to generated libs ([#10129](https://github.com/googleapis/google-cloud-cpp/pull/10129))
+- feat(generator): generate simple samples for `*Client` ([#10118](https://github.com/googleapis/google-cloud-cpp/pull/10118))
+- feat: add mock library w/ StreamRange ([#9998](https://github.com/googleapis/google-cloud-cpp/pull/9998))
+- doc(common): make authentication docs easier to find ([#10110](https://github.com/googleapis/google-cloud-cpp/pull/10110))
+- fix: configure context in async retries ([#10100](https://github.com/googleapis/google-cloud-cpp/pull/10100))
+- doc: document when GrpcNumChannelsOption applies ([#10000](https://github.com/googleapis/google-cloud-cpp/pull/10000))
+- feat(generator): make idempotency policy non-abstract ([#9981](https://github.com/googleapis/google-cloud-cpp/pull/9981))
+- fix(common): preserve `ErrorInfo` on retry errors ([#9971](https://github.com/googleapis/google-cloud-cpp/pull/9971))
+
 ## v2.3.0 - 2022-10
 
 ### New Libraries