fix some docstrings

[ewu63]

Purpose

I cleaned up the docs a bit and fixed some docstrings/RST problems.

Expected time until merged

Soon

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)
• [x] Documentation update
• [x] 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[bot]]

Codecov Report

Merging #162 (8edbe4b) into main (bb27e51) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #162   +/-   ##
=======================================
  Coverage   63.93%   63.93%           
=======================================
  Files          47       47           
  Lines       11819    11819           
=======================================
  Hits         7556     7556           
  Misses       4263     4263           

Impacted Files	Coverage Δ
pygeo/constraints/DVCon.py	71.72% <ø> (ø)
pygeo/constraints/curvatureConstraint.py	87.73% <ø> (ø)
pygeo/geo_utils/ffd_generation.py	83.89% <ø> (ø)
pygeo/geo_utils/pointselect.py	7.14% <ø> (ø)
pygeo/parameterization/BaseDVGeo.py	70.00% <ø> (ø)
pygeo/parameterization/DVGeo.py	66.35% <ø> (ø)
pygeo/parameterization/DVGeoAxi.py	77.21% <ø> (ø)
pygeo/parameterization/DVGeoCST.py	88.78% <ø> (ø)
pygeo/parameterization/DVGeoESP.py	64.88% <ø> (ø)
pygeo/parameterization/DVGeoMulti.py	89.77% <ø> (ø)
... and 4 more

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