[SYCL][DOC] Update buffer_location property spec (#5739)

Update spec accordingly to the changes from #5604. buffer_location property will be ignored if the device it passed to doesn't support it.
Signed-off-by: mdimakov <[email protected]>

Author: maximdimakov

sycl/doc/extensions/supported/sycl_ext_intel_buffer_location.asciidoc

@@ -82,7 +82,8 @@ a|
 ```c++
 property::buffer_location
 ``` | The buffer_location property notifies the SYCL device compiler that the given accessor will only ever point to the memory identified by the int template parameter of its instance class.
-It also notifies the SYCL runtime to store the given accessor in that memory. | Yes
+It also notifies the SYCL runtime to store the given accessor in that memory. 
+This property is meaningful only when the kernel is submitted to a device that has more than one type of global memory (e.g. an FPGA). When a kernel using this property is submitted to a different device, the property is ignored. | Yes
 |===
 --