[OSDOCS-14647]: Config custom API server cert for a hosted cluster

[lahinson]

Version(s): 4.17+

Issue: https://issues.redhat.com/browse/OSDOCS-14647

Link to docs preview:

• Configuring a custom API server certificate in a hosted cluster: https://97081--ocpdocs-pr.netlify.app/openshift-enterprise/latest/hosted_control_planes/hcp-deploy/hcp-deploy-aws.html#hcp-custom-cert_hcp-deploy-aws (this module is included in the "Deploying HCP" sections for AWS, bare metal, OpenShift Virtualization, and non-bare-metal)
• Adding API server certificates: https://97081--ocpdocs-pr.netlify.app/openshift-enterprise/latest/security/certificates/api-server

QE review:

• QE has approved this change.

Additional information: This PR adds a procedure about configuring a custom API server certificate for a hosted cluster. It also corrects a few minor formatting issues ahead of the DITA migration.

[ocpdocs-previewbot]

🤖 Thu Aug 07 17:42:09 - Prow CI generated the docs preview:

https://97081--ocpdocs-pr.netlify.app/openshift-enterprise/latest/hosted_control_planes/hcp-deploy/hcp-deploy-aws.html
https://97081--ocpdocs-pr.netlify.app/openshift-enterprise/latest/hosted_control_planes/hcp-deploy/hcp-deploy-bm.html
https://97081--ocpdocs-pr.netlify.app/openshift-enterprise/latest/hosted_control_planes/hcp-deploy/hcp-deploy-non-bm.html
https://97081--ocpdocs-pr.netlify.app/openshift-enterprise/latest/hosted_control_planes/hcp-deploy/hcp-deploy-virt.html
https://97081--ocpdocs-pr.netlify.app/openshift-enterprise/latest/security/certificates/api-server.html

[openshift-ci]

@lahinson: all tests passed!

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