xilem: Docs updating #2604

Job	Run time
cargo clippy (windows-latest)	4m 54s
cargo clippy (macos-latest)	2m 40s
cargo check (aarch64-android)	19s
cargo clippy (wasm32)	2m 0s
cargo clippy (ubuntu-latest)	3m 10s
Prime LFS Cache	4s
cargo check (msrv) (windows-latest)	1m 27s
cargo check (msrv) (macos-latest)	43s
formatting	32s
cargo test (wasm32)	20s
cargo check (msrv) (ubuntu-latest)	47s
cargo check (msrv) (wasm32)	17s
cargo doc	42s
typos	4s
cargo test (windows-latest)	3m 16s
cargo test (macos-latest)	1m 54s
cargo test (ubuntu-latest)	3m 11s
	26m 20s

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