masonry: add docs for `TreeArena::get_id_path` (#573) #1431

Job	Run time
cargo check (aarch64-android)	25s
cargo clippy (windows-latest)	3m 20s
cargo check (msrv) (wasm32)	20s
cargo check (msrv) (windows-latest)	1m 49s
cargo clippy (macos-latest)	1m 21s
cargo check (msrv) (macos-latest)	28s
cargo clippy (ubuntu-latest)	1m 24s
cargo clippy (wasm32)	1m 5s
cargo check (msrv) (ubuntu-latest)	37s
cargo doc	1m 22s
formatting	30s
Prime LFS Cache	6s
cargo test (wasm32)	25s
typos	8s
cargo test (windows-latest)	3m 56s
cargo test (macos-latest)	1m 29s
cargo test (ubuntu-latest)	3m 44s
	22m 29s

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