Added blurbs to the model unit tests that didn't have them

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3028 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/modeltests/custom_managers/models.py

@@ -1,5 +1,12 @@
 """
 23. Giving models a custom manager
+
+You can use a custom ``Manager`` in a particular model by extending the base
+``Manager`` class and instantiating your custom ``Manager`` in your model.
+
+There are two reasons you might want to customize a ``Manager``: to add extra
+``Manager`` methods, and/or to modify the initial ``QuerySet`` the ``Manager``
+returns.
 """
 
 from django.db import models
@@ -19,7 +26,7 @@ class Person(models.Model):
     def __repr__(self):
         return "%s %s" % (self.first_name, self.last_name)
 
-# An example of a custom manager that sets a core_filter on its lookups.
+# An example of a custom manager that sets get_query_set().
 
 class PublishedBookManager(models.Manager):
     def get_query_set(self):

tests/modeltests/invalid_models/models.py

@@ -1,5 +1,7 @@
 """
-26. A test to check that the model validator works can correctly identify errors in a model. 
+26. Invalid models
+
+This example exists purely to point out errors in models.
 """
 
 from django.db import models

tests/modeltests/manipulators/models.py

@@ -1,5 +1,7 @@
 """
 25. Default manipulators
+
+Each model gets an AddManipulator and ChangeManipulator by default.
 """
 
 from django.db import models

tests/modeltests/model_inheritance/models.py

@@ -1,6 +1,7 @@
 """
 XX. Model inheritance
 
+Model inheritance isn't yet supported.
 """
 
 from django.db import models

tests/modeltests/properties/models.py

@@ -1,5 +1,7 @@
 """
 22. Using properties on models
+
+Use properties on models just like on any other Python object.
 """
 
 from django.db import models