[OCPBUGS#56411]: Document creating an IPPool for static IP machine scaling

[harsh-thakare]

Summary

• Adds a procedure for creating an IPPool resource used when scaling machine sets with static IP addresses.
• Clarifies that the Whereabouts IPPool API (whereabouts.cni.cncf.io/v1alpha1) is for pod secondary-network IPAM and is not used for Machine API static IP allocation.
• Notes that DHCP-backed and static-IP machine sets can be scaled independently.

Test plan

• Confirm the new module renders under Machine scaling with static IP addresses in the Netlify PR preview.
• Verify callouts and example YAML for IPPool creation are clear and consistent with the existing machine set examples (ipamcontroller.example.io).
• Confirm the Whereabouts distinction note is accurate for QE/docs review.
• QE review for OCP 4.16+.

Version(s):
4.16+

Issue:
https://issues.redhat.com/browse/OCPBUGS-56411

Link to docs preview:

QE review:

• QE has approved this change.

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[openshift-ci]

Hi @harsh-thakare. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

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