[Backport r0.11] Beautifier layers doc

[bot-of-gabrieldemarmiesse]

Backport f0a8c74 from #2072

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[bot-of-gabrieldemarmiesse]

@joel-shor @charlielito @rahulunair @AakashKumarNain @tanzhenyu @failure-to-thrive @AndreasMadsen @Smokrow @cgarciae @Susmit-A

You are owners of some files modified in this pull request.
Would you kindly review the changes whenever you have the time to?
Thank you very much.

[AndreasMadsen]

Rubber stamp LGTM.