Merge pull request #110009 from mimckitt/patch-102

Update virtual-machine-scale-sets-upgrade-scale-set.md

Author: PRMerger12

articles/virtual-machine-scale-sets/virtual-machine-scale-sets-upgrade-scale-set.md

@@ -338,7 +338,6 @@ Some properties can only be set when you create the scale set. These properties
 - Availability Zones
 - Image reference publisher
 - Image reference offer
-- Image reference sku
 - Managed OS disk storage account type
 
 ### Properties that can only be changed based on the current value