[Jan Egil Ring (janegilring)]

This pull request updates the instructions for assigning a policy in the Azure Sovereign Cloud walkthrough to clarify the policy name to search for and to specify a more descriptive assignment name format.

Instructional improvements:

• Updated the policy search instruction to "Require a tag and its value on resources" for clarity and accuracy.
• Changed the assignment name example to "labuser-xx - Require Data Classification Tag", instructing users to personalize it with their labuser value.