docs/5-forms.md in activeadmin-2.12.0 vs docs/5-forms.md in activeadmin-2.13.0

@@ -180,10 +180,11 @@
 
 To display a list of all validation errors:
 
 ```ruby
 form do |f|
-  f.semantic_errors *f.object.errors.keys
+  f.semantic_errors *f.object.errors.attribute_names
+
   # ...
 end
 ```
 
 This is particularly useful to display errors on virtual or hidden attributes.