Move changelog entry that was backported

[andrross]

This commit fixes the changelog entry placement error in #5646

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      2 org.opensearch.cluster.service.MasterServiceTests.classMethod
      1 org.opensearch.indices.replication.SegmentReplicationRelocationIT.testCancellation
      1 org.opensearch.cluster.service.MasterServiceTests.testThrottlingForMultipleTaskTypes

• URL: https://build.ci.opensearch.org/job/gradle-check/9961/
• CommitID: 1d729c0
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.