Fix `clippy::too_long_first_doc_paragraph` lint #1615

Job	Run time
cargo check (msrv) (wasm32)	46s
cargo clippy (windows-latest)	2m 54s
cargo check (aarch64-android)	21s
cargo check (msrv) (windows-latest)	2m 0s
cargo clippy (macos-latest)	1m 1s
cargo check (msrv) (macos-latest)	47s
cargo clippy (ubuntu-latest)	1m 34s
cargo clippy (wasm32)	1m 24s
cargo check (msrv) (ubuntu-latest)	43s
cargo doc	26s
cargo fmt	24s
Prime LFS Cache	7s
cargo test (wasm32)	23s
typos	6s
cargo test (windows-latest)	1m 36s
cargo test (macos-latest)	1m 7s
cargo test (ubuntu-latest)	3m 6s
	18m 45s

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