docs: fix changelog header to consistent size (#51)

Co-authored-by: Anthonios Partheniou <partheniou@google.com>

Author: dandhlee

packages/google-cloud-ids/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-### [1.1.1](https://github.com/googleapis/python-ids/compare/v1.1.0...v1.1.1) (2022-03-05)
+## [1.1.1](https://github.com/googleapis/python-ids/compare/v1.1.0...v1.1.1) (2022-03-05)
 
 
 ### Bug Fixes