COMPMID-784: Doxygen fixes

Change-Id: I35f429fbf08dece7c759242c37e0a68b0851ce49
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/117231
Reviewed-by: Anthony Barbier <anthony.barbier@arm.com>
Tested-by: Jenkins <bsgcomp@arm.com>
diff --git a/src/core/CL/kernels/CLPermuteKernel.cpp b/src/core/CL/kernels/CLPermuteKernel.cpp
index 7001c55..132de60 100644
--- a/src/core/CL/kernels/CLPermuteKernel.cpp
+++ b/src/core/CL/kernels/CLPermuteKernel.cpp
@@ -46,7 +46,8 @@
     permute(output_shape, perm);
     return output_shape;
 }
-}
+} // namespace
+
 void CLPermuteKernel::configure(const ICLTensor *input, ICLTensor *output, const PermutationVector &perm)
 {
     ARM_COMPUTE_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::U8, DataType::S8, DataType::QS8, DataType::QASYMM8,