Accommodate new changelog generator

Author: IreneStr

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,5 +1,10 @@
 ## Summary
-
+<!--
+Attach one of the following labels to the PR: `changelog: bugfix`, `changelog: enhancement`, `changelog: other`, `changelog: non-user-facing`.
+If the changelog item is a bugfix, please use the following sentence structure: Fixes a bug where ... would ... (when ...).
+If the changelog item is meant for the changelog of another repo, start you changelog item with the repo name between square brackets, for example: * [wordpress-seo-premium] Fixes a bug where ....
+If the same changelog item is applicable to multiple changelogs/repos, add a separate changelog item for all of them.
+-->
 This PR can be summarized in the following changelog entry:
 
 *