[OSDOCS#14569] Document OpenStack image boot mode defaults

[maxwelldb]

Version(s): 4.17+

Issue: OSDOCS-14569

Link to docs preview:

QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Wed Apr 08 16:28:48 - Prow CI generated the docs preview:

https://109787--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_openstack/installing-openstack-user.html

[openshift-ci]

@maxwelldb: all tests passed!

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[maxwelldb]

/assign @tusharjadhav3302

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/assign @tusharjadhav3302

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[jeana-redhat]

The branch/enterprise-5.0 label has been added to this PR.

This is because your PR targets the main branch and is labeled for branch/enterprise-4.22. And any PR going into main must also target the latest version branch (branch/enterprise-5.0).

If the update in your PR does NOT apply to version 5.0 onward, please re-target this PR to go directly into the appropriate enterprise- version branch or branches instead of main.