docs: fix incorrect namespace in sample code

Author: kenjis

user_guide_src/source/general/helpers.rst

@@ -78,7 +78,7 @@ code into its own namespace, ``Example\Blog``. The files exist on our server at
 **/Modules/Blog/Helpers/blog_helper.php**. Within our controller we could
 use the following command to load the helper for us::
 
-    helper('Modules\Blog\blog');
+    helper('Example\Blog\blog');
 
 .. note:: The functions within files loaded this way are not truly namespaced.
     The namespace is simply used as a convenient way to locate the files.