Add docs for recent changes

[GuptaManan100]

Description

This PR adds the docs for the following PRs -

• https://github.com/vitessio/vitess/pull/14278
• https://github.com/vitessio/vitess/pull/14339
• https://github.com/vitessio/vitess/pull/14484
• https://github.com/vitessio/vitess/pull/14505

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