Fix failing doctest in rms.py

[mohammadghazaal]

Fixes #3925

Changes made in this Pull Request:

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• Issue raised/referenced?
• Tests updated/added?
• Documentation updated/added?
• package/CHANGELOG file updated?
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I certify that I can submit this code contribution as described in the Developer Certificate of Origin, under the MDAnalysis LICENSE.

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📚 Documentation preview 📚: https://mdanalysis--5192.org.readthedocs.build/en/5192/

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.72%. Comparing base (9fb8b0a) to head (f815aea).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5192      +/-   ##
===========================================
- Coverage    92.72%   92.72%   -0.01%     
===========================================
  Files          180      180              
  Lines        22472    22472              
  Branches      3188     3188              
===========================================
- Hits         20838    20837       -1     
- Misses        1176     1177       +1     
  Partials       458      458              

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[mohammadghazaal]

Hi everyone! 👋

I am a student and this is my first contribution to MDAnalysis. I noticed the doctest examples in rms.py were failing, so I went ahead and fixed them.

I have already opened a Pull Request with the fix here: #5192.

Please let me know if I need to change anything. Thanks!