docs: fix doc style & make clippy happy #1364

Job	Run time
macos	5m 54s
macos-aarch64	3m 42s
linux_native_builds (x86_64-unknown-linux-gnu)	4m 23s
minver	16s
linux_native_builds (x86_64-unknown-linux-musl)	4m 2s
rust_stable	1m 35s
rustfmt	12s
tier3 (x86_64-unknown-dragonfly)	1m 4s
tier3 (x86_64-unknown-openbsd)	1m 1s
tier3 (x86_64-unknown-haiku)	57s
cross	0s
cross_compiling	0s
redox	0s
	23m 6s

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