OSDOCS-4371 removing Public subnets requirement from private AWS install

[bscott-rh]

Version(s):
4.12, 4.14+

Issue:
https://issues.redhat.com/browse/OSDOCS-4371

Link to docs preview:

QE review:

• QE has approved this change.

[ocpdocs-previewbot]

🤖 Tue Mar 10 14:39:17 - Prow CI generated the docs preview:

https://108141--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_aws/ipi/installing-aws-private.html
https://108141--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_aws/ipi/installing-aws-specialized-region.html
https://108141--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_aws/ipi/installing-aws-vpc.html
https://108141--ocpdocs-pr.netlify.app/openshift-enterprise/latest/installing/installing_aws/ipi/installing-restricted-networks-aws-installer-provisioned.html

[openshift-ci]

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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.