Define the behavior for a 405 response
Define the behavior for a 405 response

This commit adds language to the API reference describing the behavior
of the service when a request is sent to a recognized API URI, but the
request does not use a supported HTTP method.

Change-Id: I31143ea0f7e6727b7f80f83dced10c68c44ffe1a

dreamhost/api-site,DonSchenck/api-site,Tesora/tesora-api-site,dreamhost/api-site,rackerlabs/api-site,dreamhost/api-site,Tesora/tesora-api-site,rackerlabs/api-site,Tesora/tesora-api-site,openstack/api-site,DonSchenck/api-site,dreamhost/api-site,rackerlabs/api-site,DonSchenck/api-site,openstack/api-site,DonSchenck/api-site,dreamhost/api-site,Tesora/tesora-api-site,dreamhost/api-site,dreamhost/api-site,Tesora/tesora-api-site,DonSchenck/api-site,openstack/api-site,rackerlabs/api-site,openstack/api-site,Tesora/tesora-api-site,Tesora/tesora-api-site