docs: delete MatchedPath nesting section #3771

Job	Run time
check	1m 14s
check-docs	36s
cargo-hack	8m 16s
cargo-public-api-crates (axum)	1m 31s
cargo-public-api-crates (axum-core)	1m 32s
cargo-public-api-crates (axum-extra)	2m 1s
cargo-public-api-crates (axum-macros)	1m 4s
dependencies-are-sorted	19s
cargo-deny check (advisories)	2m 4s
cargo-deny check (bans licenses sources)	2m 1s
armv5te-unknown-linux-musleabi	1m 31s
test-docs	3m 26s
test-msrv	8m 0s
test-nightly	4m 7s
test-versions (stable)	4m 23s
test-versions (beta)	2m 4s
wasm32-unknown-unknown	33s
	44m 42s

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