Report WBSM feature support in the documentation

This extension of the OpenCL tuner is still in experimental phase and
allows to control the size of batches of workgroups distributed to
compute units

Resolves COMPMID-3938

Change-Id: I8e55db6877717ef5d50bc7eee24b248b5a2f9414
Signed-off-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5027
Reviewed-by: Giorgio Arena <giorgio.arena@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/runtime/CL/CLTunerTypes.h b/arm_compute/runtime/CL/CLTunerTypes.h
index e93ef5b..508cafa 100644
--- a/arm_compute/runtime/CL/CLTunerTypes.h
+++ b/arm_compute/runtime/CL/CLTunerTypes.h
@@ -45,7 +45,7 @@
     CLTunerMode tuner_mode = CLTunerMode::NORMAL; /**< Parameter to select the level (granularity) of the tuning */
     bool        tune_wbsm  = false;               /**< Flag to tune the batches of work groups distributed to compute units.
                                                        Internally, the library will check if this feature is available on
-                                                       the target platform */
+                                                       the target platform. This OpenCL tuner extension is still in experimental phase */
 };
 
 /** Converts a string to a strong types enumeration @ref CLTunerMode