text: Title: docs: update CNAME information
  Body: > If you create a CNAME record, its presence will cause other RRsets of the same name to be hidden (“occluded”) from the public (i.e. in responses to DNS queries). This is per RFC 1912.
  > However, as far as the API is concerned, you can still retrieve and manipulate those additional RRsets. In other words, CNAME-induced hiding of additional RRsets does not apply when looking at the zone through the API.
  
  > It is currently possible to create a CNAME RRset with several records. However, this is not legal, and the response to queries for such RRsets is undefined. In short, don’t do it.
  
  etc.
  
  This is outdated.
  
  Similarly, the explanation on how bulk request validation and error responses are done may not be completely up to date.