ruff: first line formatting

[SkafteNicki]

What does this PR do?

Fixes part of #1484
src docstrings now fullfill: D415 [*] First line should end with a period, question mark, or exclamation point

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• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

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[codecov]

Codecov Report

Merging #1498 (4575e58) into master (3f7e1ac) will decrease coverage by 26%.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1498     +/-   ##
========================================
- Coverage      88%     62%    -26%     
========================================
  Files         213     213             
  Lines       10987   10987             
========================================
- Hits         9660    6842   -2818     
- Misses       1327    4145   +2818