Small formatting improvement to docs/db-api.txt

git-svn-id: http://code.djangoproject.com/svn/django/trunk@408 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/db-api.txt

@@ -43,7 +43,7 @@ double-underscore). For example::
 
     polls.get_list(pub_date__lte=datetime.datetime.now())
 
-translates (roughly) into the following SQL:
+translates (roughly) into the following SQL::
 
     SELECT * FROM polls_polls WHERE pub_date < NOW();