Fix **kwargs in docstrings

[A-CGray]

Purpose

Replaces \*\*kwargs in docstrings with \\*\\*kwargs to avoid these deprecation warnings:

/home/ali/repos/pygeo/pygeo/parameterization/DVGeoCST.py:269: DeprecationWarning: invalid escape sequence '\*'
  """

Expected time until merged

0 seconds

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 #208 (9408e5c) into main (d785374) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #208   +/-   ##
=======================================
  Coverage   64.76%   64.76%           
=======================================
  Files          47       47           
  Lines       12018    12018           
=======================================
  Hits         7783     7783           
  Misses       4235     4235           

Impacted Files	Coverage Δ
pygeo/parameterization/DVGeoCST.py	89.34% <ø> (ø)

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[marcomangano]

I also updated the description, merging

[ewu63]

Wait, isn't the solution to this to use raw strings instead of escaping stuff? I.e.

r"""
**kwargs ...
"""

IMO that's way more readable than using back slashes.