Some more small doc improvements #460

Job	Run time
Alpine Linux	2m 33s
FreeBSD-x86_64 with rust stable	44s
Linux-x86_64 with rust stable	1m 33s
Linux-x86_64 (rustls-native-roots) with rust stable	1m 7s
Linux-x86_64 (native-tls) with rust stable	1m 44s
Linux-x86_64 (native-tls-vendored) with rust stable	4m 10s
Linux-aarch64 with rust stable	1m 20s
Linux-arm with rust stable	1m 21s
Linux-i686 with rust stable	51s
Linux-powerpc with rust stable	1m 2s
Linux-powerpc64 with rust stable	49s
Linux-powerpc64le with rust stable	57s
Linux-riscv64 with rust stable	1m 15s
Linux-s390x with rust stable	42s
NetBSD-x86_64 with rust stable	1m 49s
Windows-aarch64 with rust stable	2m 47s
Windows-i686 with rust stable	3m 3s
Windows-x86_64 with rust stable	3m 1s
macOS-x86_64 with rust stable	1m 52s
macOS-aarch64 with rust stable	1m 25s
Linux-x86_64 with rust beta	1m 14s
Linux-x86_64 with rust nightly	1m 8s
	36m 27s

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