[request] Output H2 heading

[annaghi]

Thank you for developing this action; it has been very useful!

However, I recently encountered an issue where I created a release note for an incorrect tag. If this action could also output the H2 line, it could then be compared with the tag specified in github.ref_name in a subsequent step, preventing such mismatches.

Thank you for considering this request.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Please comment if this is still relevant.