Improve docs for flake8-use-pathlib rules #36687

Job	Run time
cargo build (release)	0s
mkdocs	2m 37s
cargo fmt	18s
Determine changes	12s
pre-commit	41s
python package	1m 14s
cargo build (msrv)	3m 51s
cargo fuzz build	0s
benchmarks	4m 57s
cargo clippy	1m 55s
cargo shear	25s
cargo test (linux)	1m 44s
cargo test (linux, release)	3m 38s
cargo test (wasm)	1m 32s
cargo test (windows)	2m 48s
test scripts	56s
formatter instabilities and black similarity	0s
ecosystem	2m 38s
test ruff-lsp	44s
fuzz parser	0s
	30m 10s

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