[release-20.0] Changelog 20.0: Fix broken links (#16048)

[vitess-bot]

Description

This is a backport of #16048

[vitess-bot]

Review Checklist

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.22%. Comparing base (83c14fa) to head (c053441).

Additional details and impacted files

@@               Coverage Diff                @@
##           release-20.0   #16076      +/-   ##
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+ Coverage         68.20%   68.22%   +0.02%     
================================================
  Files              1541     1541              
  Lines            197330   197330              
================================================
+ Hits             134591   134632      +41     
+ Misses            62739    62698      -41     

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