Updating RMSD docstrings

[aarongarrison]

No description provided.

[gianmarco-terrones]

The only thing Aaron changed here were docstrings, but one conda test fails. I think this is due to the stochasticity of some of the pytest tests. @dbkchu Do you know if there is a way to ask pytest (conda) to try the check again, without having to do another commit on the rmsd_doc_update branch?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.47%. Comparing base (cb0a447) to head (9e7b0f9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #254      +/-   ##
==========================================
+ Coverage   37.45%   37.47%   +0.02%     
==========================================
  Files          89       89              
  Lines       29785    29689      -96     
==========================================
- Hits        11156    11127      -29     
+ Misses      18629    18562      -67     

Flag	Coverage Δ
unittests	37.47% <ø> (+0.02%)	⬆️

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