[pydocstyle] Trim whitespace when removing blank lines after section (D413)

[jusexton]

Summary

Fixes #10050

Test Plan

Added additional scenario to D413.py and updated snapshots.

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

Formatter (stable)

ℹ️ ecosystem check encountered format errors. (no format changes; 1 project error)

openai/openai-cookbook (error)

warning: Detected debug build without --no-cache.
error: Failed to read examples/How_to_handle_rate_limits.ipynb: Expected a Jupyter Notebook, which must be internally stored as JSON, but this file isn't valid JSON: trailing comma at line 47 column 4

Formatter (preview)

ℹ️ ecosystem check encountered format errors. (no format changes; 1 project error)

openai/openai-cookbook (error)

ruff format --preview

warning: Detected debug build without --no-cache.
error: Failed to read examples/How_to_handle_rate_limits.ipynb: Expected a Jupyter Notebook, which must be internally stored as JSON, but this file isn't valid JSON: trailing comma at line 47 column 4

[MichaReiser]

Thank you