CSS-Networking: added fw app rules for resource downloads_Update prot…

[annadeAz]

…ect-azure-kubernetes-service.md

set vnet dns server -> fw ip fw app rule allow storage fw app rule allow github , docker , io .. downloads to succeed

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[Jak-MS]

@vhorne Can you review the proposed changes?

Important: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged" @MicrosoftDocs/public-repo-pr-review-team

[vhorne]

#sign-off