docs: minor updates for the install vignette #2229

Job	Run time
macos-latest with pre-built binary (release)	2m 39s
macos-latest (release)	25m 7s
windows-latest with pre-built binary (oldrel-1)	5m 7s
windows-latest (devel)	32m 37s
windows-latest with pre-built binary (release)	3m 57s
windows-latest (release)	33m 59s
windows-latest with pre-built binary (devel)	3m 46s
ubuntu-latest (devel)	21m 49s
ubuntu-latest with pre-built binary (oldrel-1)	2m 3s
ubuntu-latest (release)	13m 7s
ubuntu-latest with pre-built binary (release)	1m 53s
ubuntu-latest (oldrel-1)	14m 9s
ubuntu-latest with pre-built binary (devel)	9m 51s
macos-latest (release) full-features	37m 20s
windows-latest (release) full-features	34m 31s
ubuntu-latest (release) full-features	14m 25s
	4h 16m 20s

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