CORS-3680: update docs to include C4/C4A machine types

[jianli-wei]

• The 4.18 epic: CORS-3659 Add GCP C4/C4A Machine Series to tested instances for OCP
• The doc story (under the epic): CORS-3680 Update Docs to include new Instances

[openshift-ci-robot]

@jianli-wei: This pull request references CORS-3680 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 story to target the "4.18.0" version, but no target version was set.

In response to [this](https://github.com/openshift/installer/pull/9193): >- The 4.18 epic: [CORS-3659 Add GCP C4/C4A Machine Series to tested instances for OCP](https://issues.redhat.com/browse/CORS-3659) >- The doc story (under the epic): [CORS-3680 Update Docs to include new Instances](https://issues.redhat.com/browse/CORS-3680) > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Finstaller). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[jianli-wei]

@jianlinliu @gpei please help review, thanks!

[gpei]

/lgtm

[jianlinliu]

/lgtm

[jianli-wei]

/assign @patrickdillon

[patrickdillon]

/approve

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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[openshift-ci[bot]]

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[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: ose-installer-terraform-providers This PR has been included in build ose-installer-terraform-providers-container-v4.19.0-202411142010.p0.gdaeb526.assembly.stream.el9. All builds following this will include this PR.

[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: ose-installer-altinfra This PR has been included in build ose-installer-altinfra-container-v4.19.0-202411142010.p0.gdaeb526.assembly.stream.el9. All builds following this will include this PR.

[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: ose-baremetal-installer This PR has been included in build ose-baremetal-installer-container-v4.19.0-202411142010.p0.gdaeb526.assembly.stream.el9. All builds following this will include this PR.

[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: ose-installer-artifacts This PR has been included in build ose-installer-artifacts-container-v4.19.0-202411142010.p0.gdaeb526.assembly.stream.el9. All builds following this will include this PR.