Update New-AzureRmVirtualNetwork.md

Added a better title to the first example

Author: doctordns

src/ResourceManager/Network/Commands.Network/help/New-AzureRmVirtualNetwork.md

@@ -25,7 +25,7 @@ The **New-AzureRmVirtualNetwork** cmdlet creates an Azure virtual network.
 
 ## EXAMPLES
 
-### 1:
+### 1:  Create a virtual network with two subnets
 ```
 New-AzureRmResourceGroup -Name TestResourceGroup -Location centralus
     $frontendSubnet = New-AzureRmVirtualNetworkSubnetConfig -Name frontendSubnet