Clarify Az.DataMigration module description

[abhims14]

Updated the description of the Az.DataMigration module to specify it as a Microsoft Azure PowerShell module.

Description

Updated the description of the Az.DataMigration module to specify it as a Microsoft Azure PowerShell module.

Mandatory Checklist

• Please choose the target release of Azure PowerShell. (⚠️Target release is a different concept from API readiness. Please click below links for details.)

  • General release
  • Public preview
  • Private preview
  • Engineering build
  • No need for a release

• Check this box to confirm: I have read the Submitting Changes section of CONTRIBUTING.md and reviewed the following information:

• SHOULD update ChangeLog.md file(s) appropriately
  • Update src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md.
    • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header in the past tense.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
• SHOULD NOT adjust version of module manually in pull request

[azure-client-tools-bot-prd]

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[Copilot]

Pull Request Overview

This PR updates the module description in the help documentation for the Az.DataMigration module. The change replaces a placeholder description with a proper, formatted description.

Key Changes:

• Updates the module description from a placeholder format to a standard Microsoft Azure PowerShell module description

[isra-fel]

/azp run

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