Apply documentation suggestions from code review. #2560

Job	Run time
Build target wasm32-wasi	4m 1s
Latest build on ubuntu-latest	1m 47s
Bitrot check	4m 24s
Clippy (MSRV)	4m 35s
Latest build on windows-latest	4m 58s
Clippy (beta)	13s
Latest build on macOS-latest	2m 19s
Code coverage	20m 29s
Rustfmt	13s
Intra-doc links	5m 2s
protobuf consistency	4m 18s
UUID validity	6s
Test on ubuntu-latest	13m 9s
Test on ubuntu-latest with --features orchard	14m 15s
Test on ubuntu-latest with --features unstable-nu6	14m 9s
Test on ubuntu-latest with --features zfuture	13m 17s
Test on windows-latest	17m 47s
Test on windows-latest with --features orchard	18m 26s
Test on windows-latest with --features unstable-nu6	17m 39s
Test on windows-latest with --features zfuture	17m 49s
Test on macOS-latest	17m 3s
Test on macOS-latest with --features orchard	19m 10s
	3h 35m 9s

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