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Some references are no longer valid because the kernels/functions have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/runtime/NEON/functions/NEGenerateProposalsLayer.h b/arm_compute/runtime/NEON/functions/NEGenerateProposalsLayer.h
index 4053358..90e2307 100644
--- a/arm_compute/runtime/NEON/functions/NEGenerateProposalsLayer.h
+++ b/arm_compute/runtime/NEON/functions/NEGenerateProposalsLayer.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019-2020 Arm Limited.
+ * Copyright (c) 2019-2021 Arm Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -45,7 +45,7 @@
 /** Basic function to generate proposals for a RPN (Region Proposal Network)
  *
  * This function calls the following Neon kernels:
- * -# @ref NEComputeAllAnchors
+ * -# @ref NEComputeAllAnchorsKernel
  * -# @ref NEPermute x 2
  * -# @ref NEReshapeLayer x 2
  * -# @ref NEBoundingBoxTransform