fontique: Improve docs #246

Job	Run time
cargo clippy (android) (armv7-linux-androideabi)	1m 6s
cargo clippy (windows-latest)	2m 33s
cargo check (msrv) (windows-latest)	1m 59s
cargo check (msrv) (android) (armv7-linux-androideabi)	47s
cargo check (msrv) (macos-latest)	54s
cargo clippy (android) (aarch64-linux-android)	1m 3s
cargo check (msrv) (android) (aarch64-linux-android)	50s
cargo clippy (macos-latest)	1m 4s
cargo check (msrv) (ubuntu-latest)	53s
cargo clippy (android) (x86_64-linux-android)	1m 7s
cargo check (msrv) (android) (x86_64-linux-android)	46s
cargo clippy (ubuntu-latest)	1m 24s
cargo doc (windows-latest)	1m 21s
cargo test (windows-latest)	1m 33s
cargo doc (macos-latest)	35s
cargo fmt	40s
typos	7s
cargo doc (ubuntu-latest)	30s
cargo test (macos-latest)	44s
cargo test (ubuntu-latest)	36s
	20m 32s

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