Add description for server query
Add description for server query

Add descriptions for server query options and add some
samples for the query options.

Implement blueprint complete-todo-in-api-concept-doc

Change-Id: Id23a19ecc30f1837f4755ec898ef0389dcf23a8f

gooddata/openstack-nova,jianghuaw/nova,cyx1231st/nova,klmitch/nova,cernops/nova,dims/nova,cernops/nova,vmturbo/nova,sebrandon1/nova,NeCTAR-RC/nova,hanlind/nova,gooddata/openstack-nova,Juniper/nova,openstack/nova,mahak/nova,rajalokan/nova,vmturbo/nova,rahulunair/nova,phenoxim/nova,jianghuaw/nova,mikalstill/nova,rajalokan/nova,jianghuaw/nova,dims/nova,bigswitch/nova,zhimin711/nova,sebrandon1/nova,gooddata/openstack-nova,BeyondTheClouds/nova,mahak/nova,Juniper/nova,klmitch/nova,klmitch/nova,klmitch/nova,BeyondTheClouds/nova,mikalstill/nova,openstack/nova,openstack/nova,phenoxim/nova,BeyondTheClouds/nova,vmturbo/nova,Juniper/nova,Juniper/nova,rajalokan/nova,rahulunair/nova,cloudbase/nova,mahak/nova,alaski/nova,alaski/nova,rajalokan/nova,CEG-FYP-OpenStack/scheduler,cernops/nova,zhimin711/nova,jianghuaw/nova,hanlind/nova,vmturbo/nova,cyx1231st/nova,gooddata/openstack-nova,mikalstill/nova,NeCTAR-RC/nova,cloudbase/nova,bigswitch/nova,hanlind/nova,rahulunair/nova,CEG-FYP-OpenStack/scheduler,cloudbase/nova,sebrandon1/nova