Improve documentation #124

Job	Run time
macos	2m 2s
musllinux (x86_64-unknown-linux-musl)	1m 6s
linux-cross (aarch64)	3m 46s
musllinux (i686-unknown-linux-musl)	1m 5s
linux (x86_64)	1m 2s
linux-cross (armv7)	3m 41s
linux (i686)	57s
linux-cross (s390x)	3m 33s
musllinux-cross (aarch64-unknown-linux-musl, aarch64)	1m 24s
windows (x64)	1m 17s
linux-cross (ppc64le)	3m 46s
musllinux-cross (armv7-unknown-linux-musleabihf, armv7)	1m 22s
windows (x86)	1m 38s
linux-cross (ppc64)	1m 51s
Release	0s
	28m 30s

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