Correct the wording about filter options
Correct the wording about filter options

The current docs on the Filter Scheduler imply that filters can be
specified per request. This is not the case, so this change corrects
that page to remove this incorrect language, and make clear that only
the filters specified in the config file will be used.

Closes-Bug: #1689339

Change-Id: I3459a894481cab7d3961ef875015e2b8011e9a58

vmturbo/nova,gooddata/openstack-nova,jianghuaw/nova,rahulunair/nova,gooddata/openstack-nova,klmitch/nova,openstack/nova,mikalstill/nova,mahak/nova,jianghuaw/nova,klmitch/nova,rahulunair/nova,mikalstill/nova,openstack/nova,jianghuaw/nova,jianghuaw/nova,phenoxim/nova,gooddata/openstack-nova,Juniper/nova,gooddata/openstack-nova,klmitch/nova,vmturbo/nova,mahak/nova,mikalstill/nova,openstack/nova,rahulunair/nova,Juniper/nova,vmturbo/nova,klmitch/nova,mahak/nova,vmturbo/nova,Juniper/nova,Juniper/nova,phenoxim/nova