Fix module level documentation #948

Job	Run time
runefmt	1m 44s
docs	1m 39s
rustfmt	6s
clippy	1m 23s
basics	1s
no_default_features	47s
miri_rune_alloc	5m 18s
miri_rune	5m 54s
build_feature (capture-io)	48s
msrv	2m 0s
build_feature (cli,doc)	1m 26s
wasm	1m 3s
no_std_minimal	2m 43s
build_feature (cli,fmt)	1m 25s
build_feature (cli)	1m 25s
build_feature (workspace)	53s
build_feature (languageserver)	1m 15s
build_feature (byte-code)	50s
test	10m 58s
	41m 38s

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