Fixup post-merge comments on cleaning document
Fixup post-merge comments on cleaning document

Includes: Correctly documenting how to see the clean_step that was being
executed, and link back to the Ironic state machine for more information
on when cleaning runs.

Change-Id: Idea77144d9aad9153b8389c41765e57bb4a52978

bacaldwell/ironic,naterh/ironic,hpproliant/ironic,NaohiroTamura/ironic,SauloAislan/ironic,rdo-management/ironic,supermari0/ironic,SauloAislan/ironic,openstack/ironic,NaohiroTamura/ironic,redhat-openstack/ironic,devananda/ironic,bacaldwell/ironic,dims/ironic,ionutbalutoiu/ironic,dims/ironic,naototty/vagrant-lxc-ironic,naototty/vagrant-lxc-ironic,pshchelo/ironic,pshchelo/ironic,ionutbalutoiu/ironic,openstack/ironic,Tan0/ironic