Fixed #17571 - Fixed documentation of skipUnlessDBFeature; thanks EnTeQuAk for the report.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17459 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/topics/testing.txt

@@ -1818,7 +1818,7 @@ it would under MySQL with MyISAM tables)::
 Skip the decorated test if the named database feature is *not*
 supported.
 
-For example, the following test will not be executed if the database
+For example, the following test will only be executed if the database
 supports transactions (e.g., it would run under PostgreSQL, but *not*
 under MySQL with MyISAM tables)::