Improve efficiency of storage cleaning in mixed media envs - documentation
Improve efficiency of storage cleaning in mixed media envs -
documentation

Change https://review.opendev.org/c/openstack/ironic-python-agent/+/818712
improved efficiency of storage cleaning in hybrid NVMe + HDD
environments by adding `erase_devices_express` clean step. This is a
follow up change adding the documentation for this feature.

Story: 2009264
Task: 43498
Change-Id: I33ba925460cc31cc69e58f3e3ff31a0731aee1dc

openstack/ironic,openstack/ironic