Improve docstring for Frame with another example #8920

Job	Run time
Check wasm32 + wasm-bindgen	2m 20s
android	22s
Format + check + test	5m 54s
Check Windows	1m 41s
cargo-deny aarch64-apple-darwin	42s
cargo-deny aarch64-linux-android	40s
cargo-deny i686-pc-windows-gnu	40s
cargo-deny i686-pc-windows-msvc	42s
cargo-deny i686-unknown-linux-gnu	39s
cargo-deny wasm32-unknown-unknown	39s
cargo-deny x86_64-apple-darwin	40s
cargo-deny x86_64-pc-windows-gnu	41s
cargo-deny x86_64-pc-windows-msvc	42s
cargo-deny x86_64-unknown-linux-gnu	40s
cargo-deny x86_64-unknown-linux-musl	38s
cargo-deny x86_64-unknown-redox	39s
	18m 19s

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