The UG documentation for errata needs correction(s):

Summary:

1. Missing: "errata create" to document creating a custom errata.
2. Missing: "errata delete" to document deleting an errata 
3. Existing "Delete Errata" needs change from:
       pulp-admin repo delete_errata
   to:
       pulp-admin repo remove_errata
4. Existing "Add Errata" and "Delete Errata" sections need to be revised
   to describe repo association/unassociation.