Fix module level documentation #951

Job	Run time
rustfmt	12s
clippy	1m 26s
docs	1m 22s
runefmt	1m 41s
basics	1s
msrv	2m 2s
miri_rune	6m 20s
miri_rune_alloc	4m 41s
build_feature (capture-io)	47s
build_feature (cli,doc)	1m 22s
no_default_features	1m 5s
no_std_minimal	2m 24s
wasm	1m 0s
build_feature (cli,fmt)	1m 32s
build_feature (cli)	1m 23s
build_feature (workspace)	51s
build_feature (languageserver)	1m 16s
build_feature (byte-code)	57s
test	8m 31s
	38m 53s

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