imroved indentation of ns_config_default comments

And removed some too obsolete comments too

Change-Id: Ide9b6e4a3134b108c81f9584fd13c2580bae82b1
Reviewed-on: http://review.couchbase.org/35590
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Artem Stemkovski <artem@couchbase.com>