Improve documentation #1514

Job	Run time
docs	26s
nightly	1m 51s
clippy	1m 7s
rustfmt	28s
recursive	42s
no_default_features	22s
features (storage)	41s
features (descriptive)	34s
features (wire)	36s
features (json)	34s
features (value)	1m 16s
features (serde)	33s
loom	2m 4s
msrv	23s
test (--all-targets)	1m 49s
no_std (windows-latest, json)	44s
test (--doc)	1m 41s
tests_clippy	1m 58s
no_std (windows-latest, serde)	38s
test (-p musli-core -p musli --doc --no-default-features)	1m 38s
no_std (ubuntu-latest, json)	19s
no_std (ubuntu-latest, serde)	20s
miri	0s
fuzz	0s
	20m 44s

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