[flake8_comprehensions] update docs for unnecessary-comprehension-any-all (C419) (#10744)
Ref #3259; see in particular
https://github.com/astral-sh/ruff/issues/3259#issuecomment-2033127339
## Summary
Improve the accuracy of the docs for this lint rule/fix.
## Test Plan
Generated the docs locally and visited the page for this rule:

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Co-authored-by: Zanie Blue <contact@zanie.dev>