Update README.md

Author: Sandido

src/vm-repair/README.md

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 # Azure CLI VM Repair Extension #
 This is an extension for repairing VMs. Usually this is used to repair VMs that cannot boot by copying the 
 OS Disk to a separate repair VM copy and run [repair scripts](https://github.com/Azure/repair-script-library) against it. 
+VM Repair can also run repair scripts against the source VM itself.
 You can also create then run your own custom repair scripts, seen in the `--custom-script-file` parameter in the `az vm repair run` command. 
 
 ### How to use ###