OSDOCS-16524: Updated ROSA Architecture for DITA compliance

[EricPonvelle]

Version(s):
enterprise-4.20+

Issue:
OSDOCS-16524

Link to docs preview:

Additional information:
This PR addresses all of the Vale issues in the ROSA Architecture to meet DITA compliance.

[openshift-ci-robot]

@EricPonvelle: This pull request references OSDOCS-16524 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the task to target the "4.21.0" version, but no target version was set.

In response to this:

Version(s):
enterprise-4.20+

Issue:
OSDOCS-16524

Link to docs preview:

Additional information:
This PR addresses all of the Vale issues in the ROSA Architecture to meet DITA compliance.

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 openshift-eng/jira-lifecycle-plugin repository.

[ocpdocs-previewbot]

🤖 Fri Oct 24 22:12:28 - Prow CI generated the docs preview:

https://101079--ocpdocs-pr.netlify.app/
https://101079--ocpdocs-pr.netlify.app/openshift-rosa-hcp/latest/rosa_architecture/about-hcp.html
https://101079--ocpdocs-pr.netlify.app/openshift-rosa-hcp/latest/rosa_architecture/cloud-experts-rosa-hcp-sts-explained.html
https://101079--ocpdocs-pr.netlify.app/openshift-rosa-hcp/latest/rosa_architecture/index.html
https://101079--ocpdocs-pr.netlify.app/openshift-rosa-hcp/latest/rosa_architecture/rosa-architecture-models.html
https://101079--ocpdocs-pr.netlify.app/openshift-rosa-hcp/latest/rosa_architecture/rosa-sts-about-iam-resources.html
https://101079--ocpdocs-pr.netlify.app/openshift-rosa/latest/rosa_architecture/rosa-oidc-overview.html
https://101079--ocpdocs-pr.netlify.app/openshift-rosa/latest/rosa_architecture/rosa-sts-about-iam-resources.html
https://101079--ocpdocs-pr.netlify.app/openshift-rosa/latest/rosa_architecture/rosa-understanding.html

[openshift-ci]

@EricPonvelle: all tests passed!

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