Merge pull request Azure#3983 from c-nottingham/patch-1

Update Set-AzureRmVMSourceImage.md

Author: markcowl

src/ResourceManager/Compute/Commands.Compute/help/Set-AzureRmVMSourceImage.md

@@ -8,7 +8,7 @@ schema: 2.0.0
 # Set-AzureRmVMSourceImage
 
 ## SYNOPSIS
-Specifies the platform image for a virtual machine.
+Specifies the image for a virtual machine.
 
 ## SYNTAX