Fix doxygen references to new kernels

Resolves COMPMID-4117

Change-Id: I9945a92402e34b9cfe0ba9ef2a961b168bf62721
Signed-off-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4883
Reviewed-by: Pablo Marquez Tello <pablo.tello@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/src/runtime/cpu/operators/CpuConcatenate.h b/src/runtime/cpu/operators/CpuConcatenate.h
index 3765342..d2af3e2 100644
--- a/src/runtime/cpu/operators/CpuConcatenate.h
+++ b/src/runtime/cpu/operators/CpuConcatenate.h
@@ -35,10 +35,10 @@
 {
 /** Basic function to execute concatenate tensors along a given axis. This function calls the following kernels:
  *
- * -# @ref CpuConcatenateWidthKernel (if underlying concatenation axis is 0).
- * -# @ref CpuConcatenateHeightKernel (if underlying concatenation axis is 1).
- * -# @ref CpuConcatenateDepthKernel (if underlying concatenation axis is 2).
- * -# @ref CpuConcatenateBatchKernel (if underlying concatenation axis is 3).
+ * -# @ref kernels::CpuConcatenateWidthKernel (if underlying concatenation axis is 0).
+ * -# @ref kernels::CpuConcatenateHeightKernel (if underlying concatenation axis is 1).
+ * -# @ref kernels::CpuConcatenateDepthKernel (if underlying concatenation axis is 2).
+ * -# @ref kernels::CpuConcatenateBatchKernel (if underlying concatenation axis is 3).
  */
 class CpuConcatenate : public ICpuOperator
 {
@@ -48,7 +48,8 @@
     /** Configure operator for a given list of arguments
      *
      * @note Input and output tensor dimensions preconditions defer depending on the concatenation axis.
-     * @note Preconditions can be found respectively at @ref CpuConcatenateWidthKernel, @ref CpuConcatenateHeightKernel, @ref CpuConcatenateDepthKernel and @ref CpuConcatenateBatchKernel.
+     * @note Preconditions can be found respectively at @ref kernels::CpuConcatenateWidthKernel, @ref kernels::CpuConcatenateHeightKernel,
+     *       @ref kernels::CpuConcatenateDepthKernel and @ref kernels::CpuConcatenateBatchKernel.
      *
      * @param[in,out] srcs_vector The vectors containing all the tensors to concatenate. Data types supported: QASYMM8/QASYMM8_SIGNED/F16/F32.
      * @param[out]    dst         Output tensor. Data types supported: Same as @p srcs_vector.
@@ -58,7 +59,8 @@
     /** Static function to check if given info will lead to a valid configuration of @ref NEConcatenateLayer
      *
      * @note Input and output tensor dimensions preconditions defer depending on the concatenation axis.
-     * @note Preconditions can be found respectively at @ref CpuConcatenateWidthKernel, @ref CpuConcatenateHeightKernel, @ref CpuConcatenateDepthKernel and @ref CpuConcatenateBatchKernel.
+     * @note Preconditions can be found respectively at @ref kernels::CpuConcatenateWidthKernel, @ref kernels::CpuConcatenateHeightKernel,
+     *       @ref kernels::CpuConcatenateDepthKernel and @ref kernels::CpuConcatenateBatchKernel.
      *
      * @param[in] srcs_vector The vectors containing all the tensors info to concatenate. Data types supported: QASYMM8/QASYMM8_SIGNED/F16/F32.
      * @param[in] dst         Output tensor info. Data types supported: Same as @p srcs_vector.