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/arm_compute/core/NEON/kernels/NELKTrackerKernel.h b/arm_compute/core/NEON/kernels/NELKTrackerKernel.h
index f210558..9a8947f 100644
--- a/arm_compute/core/NEON/kernels/NELKTrackerKernel.h
+++ b/arm_compute/core/NEON/kernels/NELKTrackerKernel.h
@@ -45,6 +45,7 @@
     bool  tracking_status{ false }; /**< the tracking status of the keypoint */
 };
 
+/** Interface for NEON Array of Internal Key Points. */
 using INELKInternalKeypointArray = IArray<NELKInternalKeypoint>;
 
 /** Interface for the Lucas-Kanade tracker kernel */