[OSDOCS-15957] Add instances to documentation

[mletalie]

Version(s):

4.19+
Issue:

https://issues.redhat.com/browse/OSDOCS-15957
Link to docs preview:

QE review:

• QE has approved this change.

Additional information:

[ocpdocs-previewbot]

🤖 Tue Aug 26 12:43:09 - Prow CI generated the docs preview:

https://98009--ocpdocs-pr.netlify.app/openshift-rosa-hcp/latest/rosa_architecture/rosa_policy_service_definition/rosa-hcp-instance-types.html
https://98009--ocpdocs-pr.netlify.app/openshift-rosa/latest/rosa_architecture/rosa_policy_service_definition/rosa-instance-types.html

[openshift-ci]

@mletalie: all tests passed!

Full PR test history. Your PR dashboard.

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[arendej]

lgtm

[AedinC]

/lgtm

[mletalie]

/cherrypick enterprise-4.19

[openshift-cherrypick-robot]

@mletalie: new pull request created: #98041

In response to this:

/cherrypick enterprise-4.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[mletalie]

/cherrypick enterprise-4.20

[openshift-cherrypick-robot]

@mletalie: new pull request created: #98043

In response to this:

/cherrypick enterprise-4.20

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.