Add missing comment

Author: afeefghannam89

.github/workflows/test_role_elasticsearch.yml

@@ -18,6 +18,7 @@ on:
       - '.github/workflows/test_role_elasticsearch.yml'
       - 'molecule/elasticsearch_**'
 
+# Cancel outdated pipeline runs when a new push occurs in the pull request and a new pipeline starts.
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true