Fixed an error in a docstring.

 - Legacy-Id: 11534

Author: levkowetz

ietf/doc/models.py

@@ -575,7 +575,7 @@ class Meta:
 def save_document_in_history(doc):
     """This should be called before saving changes to a Document instance,
     so that the DocHistory entries contain all previous states, while
-    the Group entry contain the current state.  XXX TODO: Call this
+    the Document entry contain the current state.  XXX TODO: Call this
     directly from Document.save(), and add event listeners for save()
     on related objects so we can save as needed when they change, too.
     """