Fixed #15664 - Removed extra parens in commit_on_success example.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15923 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/topics/db/transactions.txt

@@ -73,7 +73,7 @@ These functions, described in detail below, can be used in two different ways:
 
             from django.db import transaction
 
-            @transaction.commit_on_success()
+            @transaction.commit_on_success
             def viewfunc(request):
                 # ...
                 # this code executes inside a transaction