Add 'Creating Arm NodePools Through the API' Section

[bryan-cox]

What this PR does / why we need it:
Adds 'Creating Arm NodePools Through the API' section to clarify how to create Arm NodePools through the API directly.

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story:
Fixes #

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.
• This change includes unit tests.

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[bryan-cox]

/area documentation

[jparrill]

/lgtm

[openshift-ci]

@bryan-cox: 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/e2e-kubevirt-aws-ovn	9f54b27	link	false	/test e2e-kubevirt-aws-ovn

Full PR test history. Your PR dashboard.

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[lahinson]

@bryan-cox Would it make sense for me to add this info to the product docs for the upcoming ACM 2.8 release? https://github.com/stolostron/rhacm-docs/blob/2.8_stage/clusters/hosted_control_planes/managing_hosted_aws.adoc#hosted-cluster-arm-aws

[bryan-cox]

@bryan-cox Would it make sense for me to add this info to the product docs for the upcoming ACM 2.8 release? https://github.com/stolostron/rhacm-docs/blob/2.8_stage/clusters/hosted_control_planes/managing_hosted_aws.adoc#hosted-cluster-arm-aws

@lahinson - Maybe? The Arm NodePool work is just for 4.14 and isn't being backported to earlier versions.

[lahinson]

@lahinson - Maybe? The Arm NodePool work is just for 4.14 and isn't being backported to earlier versions.

@bryan-cox Ah, okay. It would make more sense to add to the ACM 2.9 docs, then, as that release aligns with OCP 4.14. Thanks for confirming!

[csrwng]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bryan-cox, csrwng

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[jparrill]

/lgtm