[Doc]: Update commands are not working as expected

### Type of issue

Other (describe below)

### Feedback

https://learn.microsoft.com/en-us/powershell/module/az.network/update-azvirtualhubvnetconnection?view=azps-13.4.0#example-1

The example is to update one already existent connection, however the commands in the example do not do this.

We need a working example on how to achieve this.

### Page URL

https://learn.microsoft.com/en-us/powershell/module/az.network/update-azvirtualhubvnetconnection?view=azps-13.4.0&viewFallbackFrom=azps-13.0.0

### Content source URL

https://github.com/Azure/azure-powershell/blob/main/src/Network/Network/help/Update-AzVirtualHubVnetConnection.md

### Author

@mikefrobbins

### Document Id

7daf6d69-b3d2-27eb-f852-8e5a8a4f3610

### Platform Id

cbbd24b3-c556-fe66-9892-584e79548fbf