Make CLArithmeticSubtraction kernel and function state-less

Resolves COMPMID-4008

Change-Id: Ic5f40610e771f31e6d301dfae976c81e9c79fa8b
Signed-off-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4917
Reviewed-by: Michalis Spyrou <michalis.spyrou@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/runtime/gpu/cl/operators/ClConcatenate.h b/src/runtime/gpu/cl/operators/ClConcatenate.h
index 112e2ac..0d960a6 100644
--- a/src/runtime/gpu/cl/operators/ClConcatenate.h
+++ b/src/runtime/gpu/cl/operators/ClConcatenate.h
@@ -54,8 +54,8 @@
      *
      *
      * @param[in]     compile_context The compile context to be used.
-     * @param[in,out] src_vector      The vectors containing all the tensors to concatenate. Data types supported: All
-     * @param[out]    dst             Destination tensor. Data types supported: same as @p src_vector.
+     * @param[in,out] src_vector      The vectors containing all the tensors info to concatenate. Data types supported: All
+     * @param[out]    dst             Destination tensor info. Data types supported: same as @p src_vector.
      * @param[in]     axis            Concatenation axis. Supported underlying concatenation axis are 0, 1, 2 and 3.
      */
     void configure(const ClCompileContext &compile_context, const std::vector<ITensorInfo *> &src_vector, ITensorInfo *dst, size_t axis);