Adjust docstrings for RST render

[eirikurj]

Purpose

This PR fixes flake8 RST warnings, removes entries that show up as return values in documentation e.g., here, and a few typos.

Expected time until merged

1 day

Type of change

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (non-backwards-compatible fix or feature)
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Documentation update
• Maintenance update
• Other (please describe)

Testing

Checklist

• I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• I have run unit and regression tests which pass locally with my changes
• I have added new tests that prove my fix is effective or that my feature works
• I have added necessary documentation

[codecov]

Codecov Report

Merging #79 (9d2d8a7) into main (d9d6191) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #79   +/-   ##
=======================================
  Coverage   73.43%   73.43%           
=======================================
  Files           6        6           
  Lines         753      753           
=======================================
  Hits          553      553           
  Misses        200      200           

Impacted Files	Coverage Δ
idwarp/MultiUnstructuredMesh.py	84.61% <ø> (ø)
idwarp/UnstructuredMesh.py	62.73% <ø> (ø)

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