[docs] Update the list of OpenCL supported drivers
The following drivers have been tested on Linux >= CentOS 7.3
+* 21.21.19914: OK ( OpenCL 3.0 )
+* 21.20.19883: OK ( OpenCL 3.0 )
* 21.19.19792: OK ( OpenCL 3.0 )
* 21.18.19737: OK ( OpenCL 3.0 )
* 21.17.19709: OK ( OpenCL 3.0 )
