COMPMID-1727: CL: Implement Gather - support S32 indices

Change-Id: Ib0298dc75d25acf8db2262c0ab73ecaa6fec636c
Reviewed-on: https://review.mlplatform.org/522
Reviewed-by: Georgios Pinitas <georgios.pinitas@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/core/CL/kernels/CLGatherKernel.h b/arm_compute/core/CL/kernels/CLGatherKernel.h
index 4dac6b0..a348977 100644
--- a/arm_compute/core/CL/kernels/CLGatherKernel.h
+++ b/arm_compute/core/CL/kernels/CLGatherKernel.h
@@ -50,7 +50,7 @@
     /** Initialise the kernel's inputs and outputs
      *
      * @param[in]  input   Source tensor. Supported tensor rank: up to 4. Data type supported: U8/S8/QASYMM8/U16/S16/U32/S32/F16/F32
-     * @param[in]  indices Indices tensor. Supported tensor rank: up to 1. Must be one of the following type: S64. Each value Must be in range [0, input.shape[@p axis])
+     * @param[in]  indices Indices tensor. Supported tensor rank: up to 1. Must be one of the following types: U32/S32. Each value must be in range [0, input.shape[@p axis])
      * @param[out] output  Destination tensor. Data type supported: Same as @p input
      * @param[in]  axis    (Optional) The axis in @p input to gather @p indices from. Negative values wrap around. Defaults to 0
      */
@@ -59,7 +59,7 @@
     /** Static function to check if given info will lead to a valid configuration of @ref CLGatherKernel
      *
      * @param[in] input   Source tensor info. Supported tensor rank: up to 4. Data type supported: U8/S8/QASYMM8/U16/S16/U32/S32/F16/F32
-     * @param[in] indices Indices tensor info. Supported tensor rank: up to 4. Must be one of the following type: S64. Each value Must be in range [0, input.shape[@p axis])
+     * @param[in] indices Indices tensor info. Supported tensor rank: up to 4. Must be one of the following types: U32/S32. Each value must be in range [0, input.shape[@p axis])
      * @param[in] output  Destination tensor info. Data type supported: Same as @p input
      * @param[in] axis    (Optional) The axis in @p input to gather @p indices from. Negative values wrap around. Defaults to 0
      *