Small doc tweaks. #247

Job	Run time
cargo clippy (android) (armv7-linux-androideabi)	1m 10s
cargo check (msrv) (android) (armv7-linux-androideabi)	44s
cargo clippy (windows-latest)	2m 31s
cargo clippy (android) (aarch64-linux-android)	1m 2s
cargo check (msrv) (windows-latest)	1m 57s
cargo check (msrv) (android) (aarch64-linux-android)	49s
cargo clippy (macos-latest)	1m 7s
cargo clippy (android) (x86_64-linux-android)	1m 3s
cargo check (msrv) (macos-latest)	57s
cargo check (msrv) (android) (x86_64-linux-android)	44s
cargo clippy (ubuntu-latest)	1m 10s
cargo check (msrv) (ubuntu-latest)	49s
cargo doc (windows-latest)	1m 5s
cargo fmt	24s
cargo doc (macos-latest)	45s
cargo test (windows-latest)	1m 34s
typos	7s
cargo doc (ubuntu-latest)	32s
cargo test (macos-latest)	39s
cargo test (ubuntu-latest)	36s
	19m 45s

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