Fix documentation of cross product #743

Job	Run time
cargo check (msrv) (wasm32)	1m 47s
cargo clippy (windows-latest)	1m 56s
cargo clippy (wasm32)	1m 27s
cargo clippy (macos-latest)	1m 9s
cargo check (msrv) (windows-latest)	2m 29s
cargo doc	21s
cargo clippy (ubuntu-latest)	1m 9s
cargo check (msrv) (macos-latest)	1m 43s
formatting	21s
cargo check (msrv) (ubuntu-latest)	1m 50s
cargo test (windows-latest)	1m 4s
cargo test (wasm32)	36s
typos	6s
cargo test (macos-latest)	34s
cargo test (ubuntu-latest)	32s
	17m 4s

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