OCPBUGS-34194: Modify api description for join and transit switch subnets

[arghosh93]

Join and transit switch subnets can be configured at day 2 now and this commit is to modify api description for InternalJoinSubnet and InternalTransitSwitchSubnet to reflect recent changes.

[openshift-ci-robot]

@arghosh93: This pull request references Jira Issue OCPBUGS-34194, which is invalid:

• expected the bug to target either version "4.18." or "openshift-4.18.", but it targets "4.15" instead

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to [this](https://github.com/openshift/api/pull/2031): >Join and transit switch subnets can be configured at day 2 now and this commit is to modify api description for InternalJoinSubnet and InternalTransitSwitchSubnet to reflect recent changes. Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fapi). 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.

[openshift-ci[bot]]

Hello @arghosh93! Some important instructions when contributing to openshift/api: API design plays an important part in the user experience of OpenShift and as such API PRs are subject to a high level of scrutiny to ensure they follow our best practices. If you haven't already done so, please review the OpenShift API Conventions and ensure that your proposed changes are compliant. Following these conventions will help expedite the api review process for your PR.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: arghosh93 Once this PR has been reviewed and has the lgtm label, please assign joelspeed for approval. For more information see the Kubernetes Code Review Process.

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[arghosh93]

/jira refresh

[openshift-ci-robot]

@arghosh93: This pull request references Jira Issue OCPBUGS-34194, which is valid.

3 validation(s) were run on this bug

* bug is open, matching expected state (open) * bug target version (4.18.0) matches configured target version for branch (4.18.0) * bug is in the state POST, which is one of the valid states (NEW, ASSIGNED, POST)

Requesting review from QA contact: /cc @anuragthehatter

In response to [this](https://github.com/openshift/api/pull/2031#issuecomment-2354715189): >/jira refresh Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fapi). 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.

[openshift-ci[bot]]

@arghosh93: all tests passed!

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[openshift-merge-robot]

PR needs rebase.

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