Document RenderRoot fields #2584

Job	Run time
formatting	38s
cargo clippy (windows-latest)	5m 12s
cargo clippy (macos-latest)	3m 3s
cargo check (msrv) (wasm32)	32s
cargo clippy (ubuntu-latest)	3m 29s
cargo check (msrv) (windows-latest)	1m 37s
cargo check (aarch64-android)	27s
cargo check (msrv) (macos-latest)	1m 3s
cargo check (msrv) (ubuntu-latest)	52s
cargo clippy (wasm32)	2m 0s
Prime LFS Cache	11s
cargo doc	40s
cargo test (wasm32)	23s
typos	8s
cargo test (windows-latest)	5m 8s
cargo test (macos-latest)	2m 5s
cargo test (ubuntu-latest)	3m 38s
	31m 6s

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