Remind maintainer to ask #synapse-dev for changelog (#15303)

* Remind maintainer to ask #synapse-dev for changelog

* Changelog

changelog.d/15303.misc

+Remind the releaser to ask for changelog feedback in [#synapse-dev](https://matrix.to/#/#synapse-dev:matrix.org).

scripts-dev/release.py

@@ -280,7 +280,7 @@ def _prepare() -> None:
     )
 
     print("Opening the changelog in your browser...")
-    print("Please ask others to give it a check.")
+    print("Please ask #synapse-dev to give it a check.")
     click.launch(
         f"https://github.com/matrix-org/synapse/blob/{synapse_repo.active_branch.name}/CHANGES.md"
     )