Add list of allowed classifications in description for Maintenance Configuration

[SethuramS]

ARM (Control Plane) API Specification Update Pull Request

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Purpose of this PR

What's the purpose of this PR? Check the specific option that applies. This is mandatory!

• New resource provider.
• New API version for an existing resource provider. (If API spec is not defined in TypeSpec, the PR should have been created in adherence to OpenAPI specs PR creation guidance).
• Update existing version for a new feature. (This is applicable only when you are revising a private preview API version.)
• Update existing version to fix OpenAPI spec quality issues in S360.
• Convert existing OpenAPI spec to TypeSpec spec (do not combine this with implementing changes for a new API version).
• Other, please clarify:
  • Add list of allowed classifications in description for Maintenance Configuration

Due diligence checklist

To merge this PR, you must go through the following checklist and confirm you understood
and followed the instructions by checking all the boxes:

• I confirm this PR is modifying Azure Resource Manager (ARM) related specifications, and not data plane related specifications.
• I have reviewed following Resource Provider guidelines, including
  ARM resource provider contract and
  REST guidelines (estimated time: 4 hours).
  I understand this is required before I can proceed to the diagram Step 2, "ARM API changes review", for this PR.

Additional information

Viewing API changes

For convenient view of the API changes made by this PR, refer to the URLs provided in the table
in the Generated ApiView comment added to this PR. You can use ApiView to show API versions diff.

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[openapi-pipeline-app]

Next Steps to Merge

Next steps that must be taken to merge this PR:

• ❌ This is the public specs repo main branch which is not intended for iterative development.
  You must acknowledge that you understand that after this PR is merged, you won't be able to stop your changes from being published to Azure customers.
  If this is what you intend, add PublishToCustomers label to your PR.
  Otherwise, retarget this PR onto a feature branch, i.e. with prefix release- (see aka.ms/azsdk/api-versions#release--branches).
• ❌ This PR is in purview of the ARM review (label: ARMReview). This PR must get ARMSignedOff label from an ARM reviewer.
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• ❌ The required check named Automated merging requirements met has failed. This is the final check that must pass. Refer to the check in the PR's 'Checks' tab for details on how to fix it and consult the aka.ms/ci-fix guide. In addition, refer to step 4 in the PR workflow diagram

[openapi-pipeline-app]

Generated ApiView

Language	Package Name	ApiView Link
Go	sdk/resourcemanager/maintenance/armmaintenance	There is no API change compared with the previous version
Python	azure-mgmt-maintenance	https://apiview.dev/Assemblies/Review/a5c210eb5c0241e4bc65936462977902?revisionId=1f78ac3d77fb46cea11dc09fb219eee9

[azure-sdk]

API change check

APIView has identified API level changes in this PR and created following API reviews.

Microsoft.Maintenance