Add script to check changelog entries

[dstansby]

We've had a number of changelog entries slip through with the wrong names recently - I'm hoping this will catch any badly named changelog entries.

In the second commit I fixed the existing bad changelog entries.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.69%. Comparing base (3d07ec5) to head (c2b78a8).
⚠️ Report is 90 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3290      +/-   ##
==========================================
+ Coverage   59.17%   59.69%   +0.51%     
==========================================
  Files          78       78              
  Lines        8694     8694              
==========================================
+ Hits         5145     5190      +45     
+ Misses       3549     3504      -45     

see 5 files with indirect coverage changes

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