Update the head ref to changelog verifier (#4296)

* 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)

.github/workflows/changelog_verifier.yml

@@ -11,7 +11,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
-          ref: ${{ github.event.pull_request.head.ref }}
+          ref: ${{ github.event.pull_request.head.sha }}
 
       - uses: dangoslen/dependabot-changelog-helper@v1
 

CHANGELOG.md

@@ -12,6 +12,8 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Removed
 
 ### Fixed
+- `opensearch-service.bat start` and `opensearch-service.bat manager` failing to run ([#4289](https://github.com/opensearch-project/OpenSearch/pull/4289))
+- PR reference to checkout code for changelog verifier ([#4296](https://github.com/opensearch-project/OpenSearch/pull/4296))
 
 ### Security
 

CONTRIBUTING.md

@@ -126,8 +126,6 @@ As a contributor, you must ensure that every pull request has the changes listed
 Adding in the change is two step process -
 1. Add your changes to the corresponding section within the CHANGELOG file with dummy pull request information, publish the PR
 
-  `Your change here ([#PR_NUMBER](PR_URL))`
-
 2. Update the entry for your change in [`CHANGELOG.md`](CHANGELOG.md) and make sure that you reference the pull request there.