Fix broken intra-doc link #5278

Job	Run time
cargo-hack	2m 57s
check-docs	45s
check	2m 17s
cargo-public-api-crates (axum)	53s
cargo-public-api-crates (axum-core)	37s
cargo-deny check (advisories)	23s
dependencies-are-sorted	33s
Spell Check with Typos	0s
cargo-deny check (bans licenses sources)	25s
cargo-public-api-crates (axum-extra)	47s
cargo-public-api-crates (axum-macros)	44s
test-versions (stable)	1m 19s
test-nightly	1m 15s
test-docs	1m 31s
test-versions (beta)	3m 50s
armv5te-unknown-linux-musleabi	27s
wasm32-unknown-unknown	17s
test-msrv	2m 37s
	21m 37s

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