xilem: Docs updating #2603

Job	Run time
cargo check (msrv) (wasm32)	18s
cargo check (aarch64-android)	20s
cargo clippy (windows-latest)	4m 18s
cargo check (msrv) (windows-latest)	2m 5s
cargo clippy (macos-latest)	2m 18s
cargo clippy (wasm32)	2m 1s
cargo check (msrv) (macos-latest)	40s
cargo clippy (ubuntu-latest)	3m 17s
cargo doc	40s
cargo check (msrv) (ubuntu-latest)	42s
formatting	35s
Prime LFS Cache	4s
cargo test (wasm32)	20s
typos	3s
cargo test (windows-latest)	3m 0s
cargo test (macos-latest)	1m 53s
cargo test (ubuntu-latest)	3m 28s
	26m 2s

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