[py] Fix formatting issues in API reference

[tess-lu]

Description

Fix formatting issues in the API reference

Motivation and Context

Improve readability of API reference

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d92b0ae) 55.69% compared to head (ca5f3a1) 55.69%.

❗ Current head ca5f3a1 differs from pull request most recent head b19bb18. Consider uploading reports for the commit b19bb18 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #12137   +/-   ##
=======================================
  Coverage   55.69%   55.69%           
=======================================
  Files          86       86           
  Lines        5421     5421           
  Branches      223      223           
=======================================
  Hits         3019     3019           
  Misses       2179     2179           
  Partials      223      223           

Impacted Files	Coverage Δ
py/selenium/webdriver/chromium/webdriver.py	45.09% <ø> (ø)
py/selenium/webdriver/common/alert.py	23.07% <ø> (ø)
py/selenium/webdriver/remote/webdriver.py	40.22% <ø> (ø)

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[diemol]

Thank you, @ce86f3bb9faf71e!