release-mr: fix the issue reference string

release-mr.py

@@ -203,7 +203,7 @@ if __name__ == '__main__':
     for maintainer in maintainers:
         release_maintainers += f' @{maintainer}'
     if opts.issue is not None:
-        issue = 'See: {opts.issue}  '
+        issue = f'See: #{opts.issue}  '
     else:
         issue = ''
     description = textwrap.dedent(