Wrap doc comments in futures_ordered.rs #2303

Job	Run time
cargo bench	2m 36s
codegen	31s
cargo clippy	34s
cargo +stable build	1m 12s
cargo +beta build	1m 24s
cargo +1.36 build (futures-{core, io, sink})	3m 5s
cargo doc	27s
cargo hack check --feature-powerset	4m 51s
cargo +nightly build	1m 3s
cargo fmt	16s
cargo minimal-versions build	44s
cargo miri test	8m 33s
cargo build --target thumbv7m-none-eabi	50s
cargo build --target thumbv6m-none-eabi	48s
cargo test -Z sanitizer=address	4m 18s
cargo test (ubuntu-latest)	3m 57s
cargo +1.56 build	2m 10s
cargo test -Z sanitizer=memory	3m 12s
cargo test (macos-latest)	7m 20s
cargo test -Z sanitizer=thread	2m 56s
cargo test (windows-latest)	6m 14s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	4m 27s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	9m 48s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	8m 48s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	4m 23s
	1h 24m 27s

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