Small tweaks to Matern Covariance Documentation

[elc45]

Description

Adding a little bit of documentation for the Matern covariance function in the gp library.

Related Issue

• Closes #
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

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📚 Documentation preview 📚: https://pymc--7859.org.readthedocs.build/en/7859/

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[ricardoV94]

@elc45 pre-commit failed with trailing whitespace: https://results.pre-commit.ci/run/github/192904/1753036268.qGGCkXsWTQiBcPnt_eUqpg

[elc45]

@ricardoV94 fixed I think

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.98%. Comparing base (9629256) to head (4e56063).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7859      +/-   ##
==========================================
+ Coverage   91.67%   92.98%   +1.31%     
==========================================
  Files         108      108              
  Lines       18328    18328              
==========================================
+ Hits        16802    17043     +241     
+ Misses       1526     1285     -241     

Files with missing lines	Coverage Δ
pymc/gp/cov.py	98.66% <ø> (ø)

... and 4 files with indirect coverage changes

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[ricardoV94]

Thanks @elc45