[OSDOCS-14690]: Release note about heterogeneous node pools for HCP on IBM Power

[lahinson]

Version(s): 4.18

Issue: https://issues.redhat.com/browse/OSDOCS-14690

Link to docs preview: https://94848--ocpdocs-pr.netlify.app/openshift-enterprise/latest/hosted_control_planes/hosted-control-planes-release-notes.html#hcp-4-18-ibm-power-heterogeneous_hosted-control-planes-release-notes

QE review:

• QE has approved this change.

Change management:

• Change management is complete for this change.

Additional information: The xref in this PR will work after the following PR is merged: #92359

[ocpdocs-previewbot]

🤖 Tue Jun 17 16:15:14 - Prow CI generated the docs preview:

https://94848--ocpdocs-pr.netlify.app/openshift-enterprise/latest/hosted_control_planes/hosted-control-planes-release-notes.html

[openshift-ci]

@lahinson: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/validate-portal	58bd1d5	link	true	/test validate-portal

Full PR test history. Your PR dashboard.

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