Fix documentation for MethodRouter::into_make_service (#2176) #3851

Job	Run time
cargo-public-api-crates (axum)	1m 53s
cargo-public-api-crates (axum-core)	1m 5s
cargo-public-api-crates (axum-extra)	1m 25s
cargo-public-api-crates (axum-macros)	1m 8s
check	1m 40s
cargo-hack	4m 56s
check-docs	34s
cargo-deny check (advisories)	29s
cargo-deny check (bans licenses sources)	30s
dependencies-are-sorted	26s
Spell Check with Typos	5s
test-msrv	7m 39s
test-docs	4m 43s
armv5te-unknown-linux-musleabi	46s
test-versions (stable)	4m 16s
test-versions (beta)	2m 40s
test-nightly	2m 43s
wasm32-unknown-unknown	25s
	37m 23s

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