Fix c lib doc #1150

Job	Run time
audit	14s
unittests (stable)	3m 33s
typos	2m 40s
unittests (beta)	4m 2s
clippy	2m 29s
unittests (nightly)	3m 37s
formatting (nasl-syntax)	6s
formatting (storage)	3s
formatting (nasl-interpreter)	6s
formatting (redis-storage)	5s
formatting (json-storage)	5s
formatting (nasl-cli)	5s
rs-build-binaries / build	12m 49s
verify-syntax	1m 34s
verify-feed-update	4m 14s
	35m 42s

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