pydocstyle: Add ignore setting to linter docs

[lengau]

Summary

Adds config item lint.pydocstyle.ignore-decorators to the documentation for relevant pydocstyle linters

Test Plan

Manually checked mkdocs that it was serving well-formatted docs pages with the linter.

Fixes #12942

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

[MichaReiser]

Thanks