Update Remove-AzureRmVMDiagnosticsExtension.md

Update the incorrect PS command example

Author: yantang-msft

src/ResourceManager/Compute/Commands.Compute/help/Remove-AzureRmVMDiagnosticsExtension.md

@@ -25,7 +25,7 @@ You must pass the output of this cmdlet to the Update-AzureRmVM cmdlet to implem
 
 ### Example 1: Remove the Diagnostics extension from a virtual machine
 ```
-PS C:\>Remove-AzureRmVMDiagnosticsExtension -ResourceGroupName "ResourceGroup11" -VMName "ContosoVM22" | Update-AzureRmVM
+PS C:\>Remove-AzureRmVMDiagnosticsExtension -ResourceGroupName "ResourceGroup11" -VMName "ContosoVM22"
 ```
 
 This command removes the Diagnostics extension from a virtual machine named ContosoVM22.