Fix docs for `TryAll` and `TryAny` adapters #2346

Job	Run time
cargo +1.56 build	2m 18s
cargo test (ubuntu-latest)	4m 4s
cargo test (macos-latest)	4m 56s
cargo bench	1m 17s
cargo +stable build	1m 0s
cargo clippy	43s
cargo test (windows-latest)	6m 15s
cargo +beta build	1m 7s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	4m 23s
cargo +nightly build	1m 5s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	8m 23s
codegen	33s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	9m 21s
cargo +1.36 build (futures-{core, io, sink})	3m 42s
cargo doc	29s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	5m 36s
cargo hack check --feature-powerset	3m 18s
cargo fmt	7s
cargo miri test	9m 27s
cargo minimal-versions build	36s
cargo build --target thumbv7m-none-eabi	46s
cargo test -Z sanitizer=address	6m 16s
cargo build --target thumbv6m-none-eabi	47s
cargo test -Z sanitizer=memory	3m 22s
cargo test -Z sanitizer=thread	3m 6s
	1h 22m 57s

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