make nova boot command match data from prior example
make nova boot command match data from prior example

This patches the "Create volume from image and boot instance"
instructions such that the "nova boot" command in step 4 uses an image
id from the "nova image-list" command in step 1.  This will help avoid
confusion as to where exactly that id is coming from.

Change-Id: I9e11851beaa7548cd8c366f3b6d26d318b42e1a8

saeki-masaki/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,Akasurde/openstack-manuals,AlekhyaMallina-Vedams/openstack-manuals,openstack/openstack-manuals,gongysh2004/openstack-manual,saeki-masaki/openstack-manuals,Akasurde/openstack-manuals,openstack/openstack-manuals,gongysh2004/openstack-manual,potsmaster/openstack-manuals,kairoaraujo/openstack-manuals,potsmaster/openstack-manuals,kairoaraujo/openstack-manuals