Apply suggestions in doc

Signed-off-by: Dmitry Sidorov <dmitry.sidorov@intel.com>

Author: MrSidims

clang/include/clang/Basic/Attr.td

@@ -1296,12 +1296,12 @@ def OpenCLGlobalAddressSpace : TypeAttr {
 
 def OpenCLUSMDeviceAddressSpace : TypeAttr {
   let Spellings = [Clang<"opencl_usm_device">];
-  let Documentation = [OpenCLAddressSpaceGlobalDeviceDocs];
+  let Documentation = [OpenCLUSMAddressSpacesDocs];
 }
 
 def OpenCLUSMHostAddressSpace : TypeAttr {
   let Spellings = [Clang<"opencl_usm_host">];
-  let Documentation = [OpenCLAddressSpaceGlobalHostDocs];
+  let Documentation = [OpenCLUSMAddressSpacesDocs];
 }
 
 def OpenCLLocalAddressSpace : TypeAttr {

clang/include/clang/Basic/AttrDocs.td

@@ -3545,15 +3545,14 @@ scope) variables and static local variable as well.
   }];
 }
 
-def OpenCLAddressSpaceGlobalDeviceDocs : Documentation {
+def OpenCLUSMAddressSpacesDocs : Documentation {
   let Category = DocOpenCLAddressSpaces;
-  let Heading = "[[clang::opencl_usm_device]]";
+  let Heading = "[[clang::opencl_usm_device]], [[clang::opencl_usm_host]]";
   let Content = [{
-The usm_device address space attribute specifies that an object is allocated
-in global memory on device. It is supposed to be used only in SYCL headers and
-not in the actual OpenCL/SYCL user code. It helps distinguishing USM pointers
-that access device memory and accessors that access global memory from those
-that access host memory.
+The (usm_device) and (usm_host) address space attributes specify that an object
+is allocated in global memory on the device/host. It helps distinguishing USM
+pointers that access device memory and accessors that access global memory from
+those that access host memory.
   }];
 }