Section 3.1.3 Allowable Actions, Line 1909 (the table):

AA canDelete covers method deleteAllVersions (can delete this object)
AA canDeleteVersion covers deleteObject (can delete this doc object in the version series)

Folder only has a method called deletObject. It seems makes sense to have something separate for folder objects, since it makes sense to turn off a user's ability to delete all versions of an object, but not turn off the ability to delete a folder.

A couple of options here:

1) Create three separate allowable actions:
canDeleteAllVersions - deleteAllVersions
canDeleteVersion - deleteObject (for docs)
canDeleteFolder - deleteObject (for folders)

2) Clarify the table for what is happening for non-documents:
Doc - deleteAllVersions
Folder - deleteObject
Policy - removePolicy
Rel - delete