Improve doc formatting and linking. #112

Job	Run time
Check code formatting	5s
Linux (1.56.0)	2m 44s
Linux (stable)	13s
Linux (beta)	21s
Linux (nightly)	16s
Linux (--features serde, 1.56.0)	2m 53s
Linux (--features serde, stable)	22s
Linux (--features serde, beta)	24s
Linux (--features serde, nightly)	21s
Linux (--no-default-features --features libm, 1.56.0)	2m 46s
Linux (--no-default-features --features libm, stable)	14s
Linux (--no-default-features --features libm, beta)	18s
Linux (--no-default-features --features libm, nightly)	18s
Linux (stable, --features mint)	16s
Linux (stable, --features bytemuck)	13s
Linux (stable, --features arbitrary)	13s
Linux (nightly, --features unstable)	18s
Linux (nightly, --features unstable,serde)	22s
Result	1s
	12m 38s

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