Add descriptions of numbered resource classes and traits
Add descriptions of numbered resource classes and traits

Add descriptions about numbered resource classes and traits
in the Flavor doc.

Change-Id: I4878df606037ca95441bdefd748f4fc9eabedf97
Closes-Bug: #1800661

rahulunair/nova,openstack/nova,klmitch/nova,klmitch/nova,openstack/nova,klmitch/nova,mahak/nova,mahak/nova,openstack/nova,rahulunair/nova,klmitch/nova,rahulunair/nova,mahak/nova