Cleanup backend_tools docstrings, and minor refactorings. #19752
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Properties already show up with their docstrings in the generated docs,
so no need to list them in a separate API section (also note that the
document type of the figure attribute was wrong).
PR Summary
PR Checklist
pytest
passes).flake8
on changed files to check).flake8-docstrings
and runflake8 --docstring-convention=all
).doc/users/next_whats_new/
(follow instructions in README.rst there).doc/api/next_api_changes/
(follow instructions in README.rst there).