chore: Fix rustdoc lints #1203

Job	Run time
Check tokio02 feature	15s
Build with no-std	14s
Check io_safety feature (ubuntu-latest)	22s
Check io_safety feature (windows-latest)	56s
Checking fmt and docs	29s
Build and test (ubuntu-latest, nightly)	1m 32s
Check wasm targets (nightly)	31s
Check wasm targets (beta)	40s
Cross compile (i686-unknown-linux-gnu)	1m 56s
Check wasm targets (stable)	30s
Cross compile (powerpc-unknown-linux-gnu)	2m 7s
Build and test (ubuntu-latest, beta)	1m 42s
Cross compile (powerpc64-unknown-linux-gnu)	2m 0s
Cross compile (arm-linux-androideabi)	3m 28s
Build and test (ubuntu-latest, stable)	1m 45s
Build and test (windows-latest, nightly)	2m 42s
Build and test (windows-latest, beta)	2m 36s
Build and test (windows-latest, stable)	2m 47s
Build and test (macOS-latest, nightly)	1m 23s
Build and test (macOS-latest, beta)	1m 8s
Build and test (macOS-latest, stable)	1m 25s
	30m 28s

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