Fix some typos and lints

[Armavica]

What is this PR about?
This PR fixes some errors and lints found with ruff.

Checklist

• Explain important implementation details 👆
• Make sure that the pre-commit linting/style checks pass.
• Link relevant issues (preferably in nice commit messages)
• Are the changes covered by tests and docstrings?
• Fill out the short summary sections 👇

Major / Breaking Changes

• ...

Bugfixes / New features

• ...

Docs / Maintenance

• Cleanup some errors and lints

[codecov]

Codecov Report

Merging #6300 (b658bb9) into main (24888ac) will increase coverage by 3.28%.
The diff coverage is 83.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6300      +/-   ##
==========================================
+ Coverage   90.89%   94.18%   +3.28%     
==========================================
  Files         111      111              
  Lines       23913    23909       -4     
==========================================
+ Hits        21736    22518     +782     
+ Misses       2177     1391     -786     

Impacted Files	Coverage Δ
pymc/gp/util.py	96.55% <0.00%> (ø)
pymc/tests/distributions/test_discrete.py	98.88% <0.00%> (ø)
pymc/model_graph.py	78.82% <50.00%> (ø)
pymc/backends/arviz.py	90.75% <100.00%> (+0.67%)	⬆️
pymc/backends/ndarray.py	79.27% <100.00%> (ø)
pymc/data.py	80.08% <100.00%> (+32.11%)	⬆️
pymc/distributions/distribution.py	95.02% <100.00%> (ø)
pymc/model.py	90.32% <100.00%> (+0.14%)	⬆️
pymc/tests/tuning/test_starting.py	100.00% <100.00%> (ø)
pymc/variational/inference.py	84.97% <100.00%> (ø)
... and 16 more