Corrected error message in Many-to-many relationships docs.
@@ -54,7 +54,7 @@ You can't associate it with a ``Publication`` until it's been saved::
>>> a1.publications.add(p1)
Traceback (most recent call last):
...
- ValueError: 'Article' instance needs to have a primary key value before a many-to-many relationship can be used.
+ ValueError: "<Article: Django lets you build Web apps easily>" needs to have a value for field "id" before this many-to-many relationship can be used.
Save it!
::
