Update middleware.md #4895

Job	Run time
check	1m 36s
check-docs	23s
cargo-public-api-crates (axum)	29s
cargo-hack	4m 49s
cargo-public-api-crates (axum-core)	18s
dependencies-are-sorted	15s
cargo-public-api-crates (axum-extra)	35s
cargo-deny check (advisories)	25s
cargo-public-api-crates (axum-macros)	23s
cargo-deny check (bans licenses sources)	25s
Spell Check with Typos	7s
test-msrv	2m 28s
test-versions (stable)	2m 48s
test-docs	1m 27s
armv5te-unknown-linux-musleabi	41s
test-versions (beta)	2m 42s
test-nightly	1m 42s
wasm32-unknown-unknown	17s
	21m 50s

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