docs: fix changelog link format to match established convention

- Use full markdown link format [#115](url) instead of (#115)
- Matches existing changelog entry format

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: vaind

CHANGELOG.md

@@ -54,7 +54,7 @@ To update your existing Danger workflows:
 
 ### Fixes
 
-- Improve changelog generation for non-tagged commits and edge cases (#115)
+- Improve changelog generation for non-tagged commits and edge cases ([#115](https://github.com/getsentry/github-workflows/pull/115))
 
 ## 2.14.1