Apply documentation suggestions from code review. #2559

Job	Run time
Bitrot check	4m 20s
Latest build on ubuntu-latest	1m 53s
Build target wasm32-wasi	4m 2s
Clippy (MSRV)	4m 33s
Latest build on windows-latest	3m 56s
Latest build on macOS-latest	2m 51s
Clippy (beta)	12s
Code coverage	20m 36s
Intra-doc links	5m 4s
Rustfmt	14s
protobuf consistency	4m 47s
UUID validity	4s
Test on ubuntu-latest	13m 15s
Test on ubuntu-latest with --features orchard	13m 6s
Test on ubuntu-latest with --features unstable-nu6	13m 9s
Test on ubuntu-latest with --features zfuture	13m 8s
Test on windows-latest	17m 31s
Test on windows-latest with --features orchard	17m 43s
Test on windows-latest with --features unstable-nu6	17m 51s
Test on windows-latest with --features zfuture	17m 59s
Test on macOS-latest	18m 43s
Test on macOS-latest with --features orchard	18m 8s
	3h 33m 5s

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