Updating receiptprintjob.printbarcode

modifying height, as it was incorrectly listed as being expressed in pixels, which isn't a unit of measurement that has meaning in a POSPrinter.

windows.devices.pointofservice/receiptprintjob_printbarcode_1361148756.md

@@ -21,7 +21,7 @@ The data to be represented as a barcode.
 The symbology (encoding) of the barcode. This can be determined based on the [BarcodeSymbologies](barcodesymbologies.md) class static methods.
 
 ### -param height
-The height of the barcode, in pixels.
+The height of the barcode, expressed in the unit of measurement indicated by the [ClaimedPosPrinter.MapMode](claimedposprinter_mapmode.md) property.
 
 ### -param width
 The width of the barcode.