Fix doc. pointing to correct binary
Fix doc. pointing to correct binary

The binary installed and called to clear all OpenStack databases
is reset-db and not wipe-openstack

Change-Id: I77153381964342761d8cced4ac617419a3008c01

openstack/tripleo-image-elements,openstack/tripleo-image-elements,agroup/tripleo-puppet-elements,agroup/tripleo-puppet-elements,agroup/tripleo-puppet-elements,radez/tripleo-image-elements,rdo-management/tripleo-image-elements,agroup/tripleo-puppet-elements,radez/tripleo-image-elements,rdo-management/tripleo-image-elements