The section of the UPI documentation describing an edit to the bootstrap ignition file ("Update bootstrap ignition") should come before the step describing the upload of that same file.
verified with https://github.com/openshift/installer/blob/release-4.5/docs/user/openstack/install_upi.md#ignition-config
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.