Updating set command in example

[msJinLei]

From https://github.com/Azure/azure-powershell-pr/pull/592 & https://github.com/Azure/azure-powershell-pr/pull/593

PS C:\> $updatedgateway = Set-AzApplicationGateway -ApplicationGateway $AppGW
Finally, the third command updates the application gateway.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Update Remove-AzApplicationGatewayClientAuthConfiguration.md

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing steps
* for setting application gateway confirguartions in a variable
* for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Adding Set-AzApplicationGateway command

Adding the missing step for saving the gateway configuration.

Description

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • 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 -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here

[msJinLei]

@jaesoni Migrate your PRs to azure-powershell, please review it.

[jaesoni]

Verified the details. Thanks

#sign-off