Respect word boundaries when detecting function signature in docs #33044

Job	Run time
mkdocs	2m 41s
pre-commit	33s
Determine changes	9s
cargo fmt	16s
python package	1m 12s
cargo build (release)	5m 15s
cargo build (msrv)	3m 12s
benchmarks	4m 59s
cargo clippy	1m 50s
cargo fuzz	4m 54s
cargo shear	25s
cargo test (linux)	3m 47s
cargo test (wasm)	1m 31s
cargo test (windows)	6m 35s
formatter instabilities and black similarity	0s
test scripts	56s
test ruff-lsp	20s
ecosystem	8m 50s
Fuzz the parser	0s
	47m 25s

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