Adding more context to maintenance configuration description for Microsoft.ContainerService-2025-10-02-preview

[anushkasingh16]

SDK configuration pull request

Purpose of this PR

• Make changes to the SDK configuration only when there are no modifications to the API specification, eliminating the need for an ARM or Stewardship Board API review.

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and followed the instructions by checking all the boxes:

• I confirm this PR is modifying only SDK configurations, and not API related specifications.
• I have reviewed and used the respective tspconfig.yaml templates:
  • ARM tspconfig template
  • Data plane tspconfig template

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API Change Check

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

Language	API Review for Package
Go	sdk/resourcemanager/containerservice/armcontainerservice
Java	com.azure.resourcemanager:azure-resourcemanager-containerserviceaks-generated
JavaScript	@azure/arm-containerservice
Python	azure-mgmt-containerservice

[FumingZhang]

1. Please fix failed Swagger PrettierCheck
2. Please make changes only to specification/containerservice/resource-manager/Microsoft.ContainerService/aks/preview/2025-10-02-preview/managedClusters.json in this PR. You can update the stable API (and it should be 2025-10-01, instead of 2025-09-01) in the dev-containerservice-Microsoft.ContainerService-2025-10-01 branch.