Improve doc formatting and linking. #113

Job	Run time
Check code formatting	4s
Linux (1.56.0)	2m 48s
Linux (stable)	11s
Linux (beta)	18s
Linux (nightly)	18s
Linux (--features serde, 1.56.0)	2m 54s
Linux (--features serde, stable)	15s
Linux (--features serde, beta)	27s
Linux (--features serde, nightly)	20s
Linux (--no-default-features --features libm, 1.56.0)	2m 43s
Linux (--no-default-features --features libm, stable)	11s
Linux (--no-default-features --features libm, beta)	20s
Linux (--no-default-features --features libm, nightly)	18s
Linux (stable, --features mint)	14s
Linux (stable, --features bytemuck)	12s
Linux (stable, --features arbitrary)	11s
Linux (nightly, --features unstable)	18s
Linux (nightly, --features unstable,serde)	21s
Result	1s
	12m 24s

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