[Doc]: Az.Network `Set-AzVirtualNetworkGateway`: Wrong info about parameter `-EnablePrivateIpAddress`

### Type of issue

Other (describe below)

### Feedback

Seems the info for parameter `-EnablePrivateIpAddress` got copy pasted from parameter `-EnableActiveActiveFeature`.

```powershell
PS C:\Users\olav.birkeland> Get-Help -Name 'Set-AzVirtualNetworkGateway' -Parameter 'EnablePrivateIpAddress'

-EnablePrivateIpAddress
Flag to enable Active Active feature on virtual network gateway

Required? false
Position? named
Default value None
Accept pipeline input? False
Accept wildcard characters? false

PS C:\Users\olav.birkeland>
```

### Page URL

https://learn.microsoft.com/en-us/powershell/module/az.network/set-azvirtualnetworkgateway#-enableprivateipaddress

### Content source URL

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

### Author

_No response_

### Document Id

_No response_