remove outdated OpenCL ref from doc

Signed-off-by: Chris Perkins <[email protected]>

Author: cperkinsintel

sycl/doc/GetStartedGuide.md

@@ -711,7 +711,7 @@ GPU](#code-the-program-for-a-specific-gpu).
 
 ### Code the program for a specific GPU
 
-To assist in finding a specific OpenCL device out of all that may be available, a "device selector" may be used. A "device selector" is a ranking function that will give an integer ranking value to all the
+To assist in finding a specific SYCL compatible device out of all that may be available, a "device selector" may be used. A "device selector" is a ranking function that will give an integer ranking value to all the
 devices on the system. It can be passed to `sycl::queue`, `sycl::device` and `sycl::platform` constructors. The highest ranking device is then selected. SYCL has built-in device selectors for selecting a generic GPU, CPU, or accelerator device, as well as one for a default device. Additionally, 
 a user can define their own as function, lambda, or functor class. Device selectors returning negative values will "reject" a device ensuring it is not selected, but values 0 or higher will be selected by the highest score with ties resolved by an internal algorithm (see Section 4.6.1 of the SYCL 2020 specification)