Reworded the 'Set up a database' section of the installation docs.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17922 bcc190cf-cafb-0310-a4f2-bffc1f526a37

Author: claudep

docs/intro/install.txt

@@ -39,11 +39,9 @@ you should see something like::
 Set up a database
 -----------------
 
-If you installed Python 2.6 or later, you can skip this step for now.
-
-If not, or if you'd like to work with a "large" database engine like PostgreSQL,
-MySQL, or Oracle, consult the :ref:`database installation information
-<database-installation>`.
+This step is only necessary if you'd like to work with a "large" database engine
+like PostgreSQL, MySQL, or Oracle. To install such a database, consult the
+:ref:`database installation information <database-installation>`.
 
 Remove any old versions of Django
 ---------------------------------