Improve doc formatting and linking. (#532) #115

Job	Run time
Check code formatting	4s
Linux (1.56.0)	2m 50s
Linux (stable)	14s
Linux (beta)	18s
Linux (nightly)	17s
Linux (--features serde, 1.56.0)	2m 54s
Linux (--features serde, stable)	18s
Linux (--features serde, beta)	22s
Linux (--features serde, nightly)	24s
Linux (--no-default-features --features libm, 1.56.0)	2m 48s
Linux (--no-default-features --features libm, stable)	12s
Linux (--no-default-features --features libm, beta)	17s
Linux (--no-default-features --features libm, nightly)	16s
Linux (stable, --features mint)	12s
Linux (stable, --features bytemuck)	12s
Linux (stable, --features arbitrary)	17s
Linux (nightly, --features unstable)	18s
Linux (nightly, --features unstable,serde)	21s
Result	1s
	12m 35s

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