xilem: Docs updating #2575

Job	Run time
cargo check (msrv) (wasm32)	15s
cargo clippy (windows-latest)	5m 3s
cargo check (aarch64-android)	22s
cargo check (msrv) (windows-latest)	1m 14s
cargo clippy (macos-latest)	2m 24s
cargo check (msrv) (macos-latest)	42s
cargo clippy (ubuntu-latest)	3m 15s
cargo check (msrv) (ubuntu-latest)	38s
cargo clippy (wasm32)	1m 56s
cargo doc	43s
formatting	31s
Prime LFS Cache	6s
cargo test (wasm32)	24s
typos	5s
cargo test (windows-latest)	4m 28s
cargo test (macos-latest)	1m 34s
cargo test (ubuntu-latest)	3m 26s
	27m 6s

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