Small formatting changes to model unit tests to make them look better in the model examples online

git-svn-id: http://code.djangoproject.com/svn/django/trunk@3030 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/modeltests/custom_methods/models.py

 """
-3. Giving models custom methods and custom managers
+3. Giving models custom methods
 
 Any method you add to a model will be available to instances.
 """

tests/modeltests/m2m_and_m2o/models.py

 """
-27. Many-to-many and many-to-one relationships to the same table.
+27. Many-to-many and many-to-one relationships to the same table
 
 This is a response to bug #1535
 

tests/modeltests/pagination/models.py

 """
-20. Object Pagination
-
-Django provides a framework for paginating a list of objects in a few.  
-This is often useful for dividing search results or long lists of objects
-in to easily readable pages.
-
+28. Object pagination
 
+Django provides a framework for paginating a list of objects in a few lines
+of code. This is often useful for dividing search results or long lists of
+objects into easily readable pages.
 """
+
 from django.db import models
 
 class Article(models.Model):

tests/modeltests/transactions/models.py

 """
-XXX. Transactions
+15. Transactions
 
 Django handles transactions in three different ways. The default is to commit
 each transaction upon a write, but you can decorate a function to get

tests/modeltests/validation/models.py

 """
-XX. Validation
+29. Validation
+
+This is an experimental feature!
 
 Each model instance has a validate() method that returns a dictionary of
 validation errors in the instance's fields. This method has a side effect