Update the head ref to changelog verifier (#4296)

[kotwanikunal]

• Update changelog contribution guide

Signed-off-by: Kunal Kotwani kkotwani@amazon.com

• Fix reference to pull request

Signed-off-by: Kunal Kotwani kkotwani@amazon.com

Signed-off-by: Kunal Kotwani kkotwani@amazon.com
(cherry picked from commit 5dd7947)

Description

• Backports Update the head ref to changelog verifier #4296

Issues Resolved

• N/A

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: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/2099/
• CommitID: 67e9399

[codecov-commenter]

Codecov Report

Merging #4298 (67e9399) into 2.x (a78d345) will decrease coverage by 0.06%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #4298      +/-   ##
============================================
- Coverage     70.68%   70.62%   -0.07%     
- Complexity    56916    56927      +11     
============================================
  Files          4570     4570              
  Lines        273527   273527              
  Branches      40110    40110              
============================================
- Hits         193353   193170     -183     
- Misses        63949    64179     +230     
+ Partials      16225    16178      -47     

Impacted Files	Coverage Δ
...adonly/AddIndexBlockClusterStateUpdateRequest.java	0.00% <0.00%> (-75.00%)	⬇️
...n/admin/indices/readonly/AddIndexBlockRequest.java	17.85% <0.00%> (-53.58%)	⬇️
...ch/transport/ReceiveTimeoutTransportException.java	50.00% <0.00%> (-50.00%)	⬇️
...cluster/coordination/PendingClusterStateStats.java	20.00% <0.00%> (-48.00%)	⬇️
...rch/client/transport/NoNodeAvailableException.java	28.57% <0.00%> (-42.86%)	⬇️
...readonly/TransportVerifyShardIndexBlockAction.java	9.75% <0.00%> (-41.47%)	⬇️
...indices/readonly/TransportAddIndexBlockAction.java	20.68% <0.00%> (-41.38%)	⬇️
.../admin/indices/readonly/AddIndexBlockResponse.java	0.00% <0.00%> (-37.50%)	⬇️
...search/search/aggregations/pipeline/EwmaModel.java	24.44% <0.00%> (-33.34%)	⬇️
...nsearch/index/shard/IndexShardClosedException.java	66.66% <0.00%> (-33.34%)	⬇️
... and 465 more

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