chore: Fix some docstring typos and apply refactors suggested by Sourcery

[edgarrmondragon]

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📚 Documentation preview 📚: https://meltano-sdk--2052.org.readthedocs.build/en/2052/

[codspeed-hq]

CodSpeed Performance Report

Merging #2052 will not alter performance

_{Comparing chore/source-refactors-typos (3fd7bb0) with main (80e31a2)}

Summary

✅ 1 untouched benchmarks

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (80e31a2) 86.83% compared to head (3fd7bb0) 87.00%.

Files	Patch %	Lines
singer_sdk/authenticators.py	40.00%	3 Missing ⚠️
singer_sdk/helpers/_state.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2052      +/-   ##
==========================================
+ Coverage   86.83%   87.00%   +0.16%     
==========================================
  Files          58       58              
  Lines        4885     4855      -30     
  Branches      777      764      -13     
==========================================
- Hits         4242     4224      -18     
+ Misses        456      446      -10     
+ Partials      187      185       -2     

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