Deal with leftover master branch references

[IAlibay]

Towards #3542

PR Checklist

• Docs?
• Issue raised/referenced?

Developers certificate of origin

• I certify that this contribution is covered by the LGPLv2.1+ license as defined in our LICENSE and adheres to the Developer Certificate of Origin.

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📚 Documentation preview 📚: https://mdanalysis--4235.org.readthedocs.build/en/4235/

[github-actions]

Linter Bot Results:

Hi @IAlibay! Thanks for making this PR. We linted your code and found the following:

There are currently no issues detected! 🎉

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6e80c28) 93.62% compared to head (aca10ee) 93.62%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #4235   +/-   ##
========================================
  Coverage    93.62%   93.62%           
========================================
  Files          193      193           
  Lines        25304    25304           
  Branches      4064     4064           
========================================
  Hits         23692    23692           
  Misses        1096     1096           
  Partials       516      516           

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