chore(PR): Add Reviewed-on in commit message (#9623)

Author: appleboy

templates/repo/issue/view_content/pull.tmpl

@@ -153,7 +153,7 @@
 										<input type="text" name="merge_title_field" value="{{.Issue.PullRequest.GetDefaultMergeMessage}}">
 									</div>
 									<div class="field">
-										<textarea name="merge_message_field" rows="5" placeholder="{{$.i18n.Tr "repo.editor.commit_message_desc"}}">{{$approvers}}</textarea>
+										<textarea name="merge_message_field" rows="5" placeholder="{{$.i18n.Tr "repo.editor.commit_message_desc"}}">Reviewed-on: {{$.Issue.HTMLURL}}&#13;&#10;{{$approvers}}</textarea>
 									</div>
 									<button class="ui green button" type="submit" name="do" value="merge">
 										{{$.i18n.Tr "repo.pulls.merge_pull_request"}}
@@ -185,7 +185,7 @@
 										<input type="text" name="merge_title_field" value="{{.Issue.PullRequest.GetDefaultMergeMessage}}">
 									</div>
 									<div class="field">
-										<textarea name="merge_message_field" rows="5" placeholder="{{$.i18n.Tr "repo.editor.commit_message_desc"}}">{{$approvers}}</textarea>
+										<textarea name="merge_message_field" rows="5" placeholder="{{$.i18n.Tr "repo.editor.commit_message_desc"}}">Reviewed-on: {{$.Issue.HTMLURL}}&#13;&#10;{{$approvers}}</textarea>
 									</div>
 									<button class="ui green button" type="submit" name="do" value="rebase-merge">
 										{{$.i18n.Tr "repo.pulls.rebase_merge_commit_pull_request"}}
@@ -205,7 +205,7 @@
 										<input type="text" name="merge_title_field" value="{{.Issue.PullRequest.GetDefaultSquashMessage}}">
 									</div>
 									<div class="field">
-										<textarea name="merge_message_field" rows="5" placeholder="{{$.i18n.Tr "repo.editor.commit_message_desc"}}">{{$commitMessages}}{{$approvers}}</textarea>
+										<textarea name="merge_message_field" rows="5" placeholder="{{$.i18n.Tr "repo.editor.commit_message_desc"}}">{{$commitMessages}}Reviewed-on: {{$.Issue.HTMLURL}}&#13;&#10;{{$approvers}}</textarea>
 									</div>
 									<button class="ui green button" type="submit" name="do" value="squash">
 										{{$.i18n.Tr "repo.pulls.squash_merge_pull_request"}}