Document usage of concrete state in `FromRequest` macro (#2550) (#2581) #4373

Job	Run time
cargo-hack	3m 1s
cargo-public-api-crates (axum)	1m 0s
cargo-public-api-crates (axum-core)	52s
check	2m 8s
check-docs	22s
cargo-public-api-crates (axum-extra)	56s
cargo-deny check (advisories)	25s
cargo-public-api-crates (axum-macros)	48s
cargo-deny check (bans licenses sources)	35s
dependencies-are-sorted	47s
Spell Check with Typos	4s
test-msrv	6m 21s
test-nightly	1m 49s
test-versions (stable)	1m 43s
test-docs	1m 42s
test-versions (beta)	3m 55s
armv5te-unknown-linux-musleabi	25s
wasm32-unknown-unknown	31s
	27m 24s

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