Remove wrong docs

docs/dev/06_merging_app_settings.rst

@@ -23,7 +23,3 @@ the following into your ``settings.py``::
             "HOST": "127.0.0.1",
             "PORT": 5432,
         }
-
-If you install new apps and want to configure these, or need some other settings you can easily add
-settings to your ``settings.py``.  Only settings that do not exist in the
-main ``settings.py`` will be respected.