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/CL/kernels/CLSobel3x3Kernel.h b/arm_compute/core/CL/kernels/CLSobel3x3Kernel.h
index fd596d9..21f70a8 100644
--- a/arm_compute/core/CL/kernels/CLSobel3x3Kernel.h
+++ b/arm_compute/core/CL/kernels/CLSobel3x3Kernel.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016, 2017 ARM Limited.
+ * Copyright (c) 2016-2018 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -36,9 +36,9 @@
 public:
     /** Default constructor: initialize all the pointers to nullptr and parameters to zero. */
     CLSobel3x3Kernel();
-    /** Prevent instances of this class from being copied (As this class contains pointers). */
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
     CLSobel3x3Kernel(const CLSobel3x3Kernel &) = delete;
-    /** Prevent instances of this class from being copied (As this class contains pointers). */
+    /** Prevent instances of this class from being copied (As this class contains pointers) */
     CLSobel3x3Kernel &operator=(const CLSobel3x3Kernel &) = delete;
     /** Allow instances of this class to be moved */
     CLSobel3x3Kernel(CLSobel3x3Kernel &&) = default;