COMPMID-417 - Fixed doxygen comments in XArithmeticAddition and in XArithmeticSubtraction

Change-Id: I7c9457dd84dc023c1bf3780757bcc6aef968483a
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/82246
Reviewed-by: Moritz Pflanzer <moritz.pflanzer@arm.com>
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
diff --git a/arm_compute/runtime/CL/functions/CLArithmeticSubtraction.h b/arm_compute/runtime/CL/functions/CLArithmeticSubtraction.h
index 0a3b00f..eedeaa8 100644
--- a/arm_compute/runtime/CL/functions/CLArithmeticSubtraction.h
+++ b/arm_compute/runtime/CL/functions/CLArithmeticSubtraction.h
@@ -34,7 +34,7 @@
 
 /** Basic function to run @ref CLArithmeticSubtractionKernel
  *
- * @note The tensor data type for the inputs must be U8, S16, F16, F32
+ * @note The tensor data type for the inputs must be U8/QS8/QS16/S16/F16/F32.
  * @note The function performs an arithmetic subtraction between two tensors.
  */
 class CLArithmeticSubtraction : public ICLSimpleFunction