Fix module level documentation #952

Job	Run time
clippy	1m 25s
docs	1m 18s
rustfmt	7s
runefmt	1m 38s
basics	1s
no_default_features	54s
miri_rune	5m 54s
miri_rune_alloc	4m 31s
build_feature (capture-io)	58s
msrv	1m 59s
no_std_minimal	2m 13s
build_feature (cli,doc)	1m 24s
wasm	56s
build_feature (cli,fmt)	1m 26s
build_feature (cli)	1m 26s
build_feature (workspace)	1m 25s
build_feature (languageserver)	1m 13s
build_feature (byte-code)	58s
test	11m 41s
	41m 27s

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