COMPMID-1008: Fix Doxygen issues

Change-Id: Ie73d8771f85d1f5b059f3a56f1bbd73c98e94a38
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/124723
Reviewed-by: Michalis Spyrou <michalis.spyrou@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
diff --git a/src/core/CL/cl_kernels/optical_flow_pyramid_lk.cl b/src/core/CL/cl_kernels/optical_flow_pyramid_lk.cl
index e1131d5..20474f0 100644
--- a/src/core/CL/cl_kernels/optical_flow_pyramid_lk.cl
+++ b/src/core/CL/cl_kernels/optical_flow_pyramid_lk.cl
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 ARM Limited.
+ * Copyright (c) 2017-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -44,7 +44,7 @@
     float x;               /**< The x coordinate. */
     float y;               /**< The y coordinate. */
     float tracking_status; /**< A zero indicates a lost point. Initialized to 1 by corner detectors. */
-    float dummy;
+    float dummy;           /**< Dummy member for alignment. */
 } InternalKeypoint;
 
 /** Threshold for the determinant. Used for lost tracking criteria */