Warn on `missing_docs` #380

Job	Run time
Test and coverage	2m 39s
Test with address sanitizer	4m 35s
Test with leak sanitizer	3m 8s
Benchmark	6m 5s
Generate documentation	27s
Check generated C header	1m 7s
Lint with clippy	1m 10s
No-op rebuilds	57s
Check code formatting	17s
Build [ubuntu-latest, 1.63.0, dev, ]	3m 26s
Build [ubuntu-latest, 1.63.0, release, ]	3m 45s
Test with release build	2m 41s
Build [ubuntu-latest, stable, dev, ]	32s
Build [ubuntu-latest, stable, release, ]	45s
Build [macos-latest, 1.63.0, dev, ]	3m 59s
Build [macos-latest, 1.63.0, release, ]	3m 40s
Build [macos-latest, stable, dev, ]	40s
Build [macos-latest, stable, release, ]	43s
Build [ubuntu-latest, stable, dev, --no-default-features]	31s
	41m 7s

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