Fixed #5037 -- Fixed use of wrong field type in a db-api docs example…

…, thanks ubernostrum.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@5783 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/db-api.txt

@@ -20,7 +20,7 @@ a weblog application::
 
     class Author(models.Model):
         name = models.CharField(maxlength=50)
-        email = models.URLField()
+        email = models.EmailField()
 
         def __unicode__(self):
             return self.name