Addition of release notes

Signed-off-by: Rohit Nayak <[email protected]>

changelog/21.0/21.0.3/changelog.md

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+# Changelog of Vitess v21.0.3
+
+### Bug fixes 
+#### Backup and Restore
+ * [release-21.0] Replace uses of os.Create with os2.Create within backup/restore workflows (#17648) [#17666](https://github.com/vitessio/vitess/pull/17666) 
+#### Query Serving
+ * [release-21.0] Fix how we generate the query serving error documentation (#17516) [#17536](https://github.com/vitessio/vitess/pull/17536)
+ * [release-21.0] Fix panic inside schema tracker (#17659) [#17673](https://github.com/vitessio/vitess/pull/17673)
+ * [release-21.0] smartconnpool: do not allow connections to starve (#17675) [#17685](https://github.com/vitessio/vitess/pull/17685) 
+#### VReplication
+ * [release-21.0] VReplication: Address SwitchTraffic bugs around replication lag and cancel on error (#17616) [#17644](https://github.com/vitessio/vitess/pull/17644)
+ * [release-21.0] VDiff: fix race when a vdiff resumes on vttablet restart (#17638) [#17694](https://github.com/vitessio/vitess/pull/17694)
+ * [release-21.0] Atomic Copy: Fix panics when the copy phase starts in some clusters (#17717) [#17748](https://github.com/vitessio/vitess/pull/17748) 
+#### VTAdmin
+ * [release-21.0] fix SchemaCacheConfig.DefaultExpiration (#17609) [#17612](https://github.com/vitessio/vitess/pull/17612) 
+#### VTGate
+ * [release-21.0] Increase health check buffer size [#17636](https://github.com/vitessio/vitess/pull/17636)
+### Dependencies 
+#### Java
+ * [release-21.0] Bump io.netty:netty-handler from 4.1.110.Final to 4.1.118.Final in /java (#17730) [#17733](https://github.com/vitessio/vitess/pull/17733)
+### Enhancement 
+#### VTAdmin
+ * [release-21.0] VTAdmin: update logo and favicon for the new Vitess logos (#17715) [#17725](https://github.com/vitessio/vitess/pull/17725)
+### Internal Cleanup 
+#### VReplication
+ * [release-21.0] Always make sure to escape all strings (#17649) [#17657](https://github.com/vitessio/vitess/pull/17657)
+### Release 
+#### General
+ * [release-21.0] Bump to `v21.0.3-SNAPSHOT` after the `v21.0.2` release [#17600](https://github.com/vitessio/vitess/pull/17600)
+

changelog/21.0/21.0.3/release_notes.md

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+# Release of Vitess v21.0.3
+The entire changelog for this release can be found [here](https://github.com/vitessio/vitess/blob/main/changelog/21.0/21.0.3/changelog.md).
+
+The release includes 13 merged Pull Requests.
+
+Thanks to all our contributors: @GuptaManan100, @app/vitess-bot, @vitess-bot
+

changelog/21.0/README.md

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 ## v21.0
+* **[21.0.3](21.0.3)**
+	* [Changelog](21.0.3/changelog.md)
+	* [Release Notes](21.0.3/release_notes.md)
+
 * **[21.0.2](21.0.2)**
 	* [Changelog](21.0.2/changelog.md)
 	* [Release Notes](21.0.2/release_notes.md)