Remove reference to the removed parameter

The records_use_fips parameter was removed when v1 API support was
removed[1]. This change removes remaining reference to the parameter
in README.

[1] fe68f0f1bc

Change-Id: Ica3cf7eba8a1e4ef87a832191b88fafd0afe02d4

README.rst

@@ -55,12 +55,6 @@ Howto
 
     'dns': 'designate_policy.json',
 
-5. (Optional) Within your horizon settings file(s) (either the local settings or the other settings.py), add
-   the line below.  This will make it so the record create/update screen uses a drop down of your floating ip
-   addresses instead of a free form text field::
-
-    DESIGNATE = { 'records_use_fips': True }
-
 
 Test
 ----