xilem: Docs updating #2609

Job	Run time
cargo check (msrv) (windows-latest)	1m 54s
cargo check (aarch64-android)	25s
cargo check (msrv) (macos-latest)	40s
cargo check (msrv) (wasm32)	18s
cargo clippy (windows-latest)	4m 41s
cargo check (msrv) (ubuntu-latest)	35s
cargo clippy (macos-latest)	2m 40s
cargo clippy (wasm32)	2m 8s
cargo clippy (ubuntu-latest)	3m 13s
cargo doc	44s
formatting	1m 20s
Prime LFS Cache	4s
cargo test (wasm32)	19s
typos	6s
cargo test (windows-latest)	3m 39s
cargo test (macos-latest)	1m 49s
cargo test (ubuntu-latest)	3m 13s
	27m 48s

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