Document RenderRoot fields (#824) #2589

Job	Run time
Prime LFS Cache	10s
formatting	32s
cargo clippy (windows-latest)	4m 45s
cargo clippy (wasm32)	1m 59s
cargo clippy (macos-latest)	4m 16s
cargo check (msrv) (windows-latest)	1m 22s
cargo clippy (ubuntu-latest)	3m 26s
cargo check (msrv) (wasm32)	22s
cargo check (msrv) (macos-latest)	38s
cargo check (aarch64-android)	27s
cargo check (msrv) (ubuntu-latest)	41s
cargo doc	40s
cargo test (wasm32)	26s
typos	3s
cargo test (windows-latest)	3m 50s
cargo test (macos-latest)	1m 45s
cargo test (ubuntu-latest)	3m 34s
	28m 56s

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