Document RenderRoot fields #2583

Job	Run time
Prime LFS Cache	5s
cargo clippy (windows-latest)	35s
cargo check (msrv) (windows-latest)	1m 41s
cargo clippy (macos-latest)	35s
cargo clippy (wasm32)	2m 4s
cargo check (msrv) (macos-latest)	37s
cargo check (aarch64-android)	25s
cargo clippy (ubuntu-latest)	43s
cargo check (msrv) (ubuntu-latest)	45s
formatting	34s
cargo test (wasm32)	22s
cargo check (msrv) (wasm32)	22s
cargo doc	47s
typos	3s
cargo test (windows-latest)	3m 29s
cargo test (macos-latest)	1m 29s
cargo test (ubuntu-latest)	4m 1s
	18m 37s

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