Update osinfo_parameters.dsc.yaml

Author: SteveL-MSFT

dsc/examples/osinfo_parameters.dsc.yaml

@@ -2,6 +2,7 @@ $schema: https://raw.githubusercontent.com/PowerShell/DSC/main/schemas/2023/08/c
 parameters:
   osFamily:
     type: string
+    # the use of `concat()` here is just an example of using an expression for a defaultValue
     defaultValue: "[concat('Win','dows')]"
     allowedValues:
       - Windows