Changelog for release notes

[Licenser]

Pull request

Description

Fix headers in release notes.

Checklist

• The RFC, if required, has been submitted and approved
• Any user-facing impact of the changes is reflected in docs.tremor.rs
• The code is tested
• Use of unsafe code is reasoned about in a comment
• Update CHANGELOG.md appropriately, recording any changes, bug fixes, or other observable changes in behavior
• The performance impact of the change is measured (see below)

Performance

-/-

[codecov]

Codecov Report

Merging #2355 (ad0ad24) into main (f91e72e) will increase coverage by 2.18%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2355      +/-   ##
==========================================
+ Coverage   88.76%   90.95%   +2.18%     
==========================================
  Files         279      279              
  Lines       59553    59553              
==========================================
+ Hits        52862    54166    +1304     
+ Misses       6691     5387    -1304     

Flag	Coverage Δ
unittests	90.95% <ø> (+2.18%)	⬆️

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see 54 files with indirect coverage changes

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