Update Set-AzFirewall.md

[dantecit0]

Description

Added example number 15 which shows how to properly add or remove Availability zones to an Azure Firewall.

Checklist

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

• SHOULD select appropriate branch. Cmdlets from Autorest.PowerShell should go to generation branch.
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• SHOULD update ChangeLog.md file(s) appropriately
  • For any service, the ChangeLog.md file can be found at 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. Add changelog in description section if PR goes into generation branch.
  • Should not change ChangeLog.md if no new release is required, such as fixing test case only.
• SHOULD have approved design review for the changes in this repository (Microsoft internal only) with following situations
  • Create new module from scratch
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  • Create new resource type which name doesn't use module name as prefix
  • Have design question before implementation
• SHOULD regenerate markdown help files if there is cmdlet API change. Instruction
• SHOULD have proper test coverage for changes in pull request.
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[azure-client-tools-bot-prd]

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[ghost]

Thank you for your contribution dantecit0! We will review the pull request and get back to you soon.

[Nickcandy]

/azp run azure-powershell - security-tools

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[dantecit0]

@microsoft-github-policy-service agree company="Microsoft"

[dantecit0]

@Nickcandy I noticed the request was merged, but item number 15 is not visible in general article, but it is if you edit it. Is this expected? Thanks!