Convert `.md` links in rule documentation to full URLs #39863

Job	Run time
Determine changes	10s
cargo build (release)	0s
mkdocs	2m 33s
cargo fmt	20s
pre-commit	3m 13s
python package	1m 22s
cargo clippy	2m 8s
cargo fuzz build	5m 10s
benchmarks	4m 7s
cargo build (msrv)	4m 47s
cargo shear	21s
cargo test (linux)	2m 0s
cargo test (linux, release)	4m 9s
cargo test (wasm)	1m 35s
cargo test (windows)	4m 15s
formatter instabilities and black similarity	0s
test scripts	1m 10s
ecosystem	3m 3s
test ruff-lsp	34s
fuzz parser	0s
	40m 57s

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