Add Attachment type in features documentation (#3046) #5044

Job	Run time
check-docs	25s
cargo-hack	5m 30s
cargo-public-api-crates (axum)	39s
check	2m 37s
cargo-public-api-crates (axum-core)	19s
cargo-public-api-crates (axum-extra)	38s
dependencies-are-sorted	44s
cargo-deny check (advisories)	24s
Spell Check with Typos	6s
cargo-public-api-crates (axum-macros)	24s
cargo-deny check (bans licenses sources)	23s
test-docs	1m 45s
test-msrv	2m 53s
test-nightly	1m 30s
armv5te-unknown-linux-musleabi	55s
test-versions (stable)	3m 26s
wasm32-unknown-unknown	17s
test-versions (beta)	4m 23s
	27m 18s

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