Fix Doxygen references

Some references are no longer valid because the kernels/functions have
been removed.

Change-Id: Iccfaabb678a4b2709442e4eb827800e63ea47b05
Signed-off-by: Michele Di Giorgio <michele.digiorgio@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/4764
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/arm_compute/graph/frontend/Layers.h b/arm_compute/graph/frontend/Layers.h
index c4de401..bf68b26 100644
--- a/arm_compute/graph/frontend/Layers.h
+++ b/arm_compute/graph/frontend/Layers.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2020 Arm Limited.
+ * Copyright (c) 2018-2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -1465,8 +1465,7 @@
 public:
     /** Construct a YOLO layer.
      *
-     * @param[in] act_info    Activation info
-     * @param[in] num_classes Number of classes to activate
+     * @param[in] act_info Activation info
      */
     YOLOLayer(ActivationLayerInfo act_info)
         : _act_info(act_info)