describe requires-python fallback in docs #42037

Job	Run time
cargo fmt	17s
Determine changes	13s
cargo build (release)	0s
pre-commit	3m 30s
mkdocs	2m 29s
python package	1m 21s
cargo clippy	2m 1s
cargo test (linux, release)	4m 12s
cargo shear	24s
cargo fuzz build	4m 2s
cargo test (wasm)	1m 43s
cargo test (linux)	2m 11s
cargo test (windows)	4m 50s
benchmarks	4m 32s
cargo build (msrv)	2m 8s
test scripts	1m 7s
formatter instabilities and black similarity	0s
ecosystem	2m 44s
test ruff-lsp	35s
fuzz parser	0s
	38m 19s

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