Updated docs, bumped UR

Author: ianayl

sycl/cmake/modules/UnifiedRuntimeTag.cmake

@@ -1,6 +1,5 @@
-# commit c1dcb31365ffd58fc4712b7bb4be4719280aab07
-# Merge: 2143085f 8f33719f
+# commit 869a089ad75815e3cc924a7a6985f810a412012f
 # Author: Li, Ian <[email protected]>
-# Date:   Tue Dec 10 13:00:46 2024 -0800
-#     Merge branch 'main' of https://github.com/oneapi-src/unified-runtime into ianayl/2way-prefetch
-set(UNIFIED_RUNTIME_TAG c1dcb31365ffd58fc4712b7bb4be4719280aab07)
+# Date:   Wed Dec 11 11:40:25 2024 -0800
+#     enforce column width
+set(UNIFIED_RUNTIME_TAG 869a089ad75815e3cc924a7a6985f810a412012f)

sycl/doc/extensions/experimental/sycl_ext_oneapi_enqueue_functions.asciidoc

@@ -633,14 +633,22 @@ a!
 ----
 namespace sycl::ext::oneapi::experimental {
 
-void prefetch(sycl::queue q, void* ptr, size_t numBytes);
+enum class prefetch_type { device, host };
 
-void prefetch(sycl::handler &h, void* ptr, size_t numBytes);
+void prefetch(sycl::queue q, void* ptr, size_t numBytes,
+              prefetch_type type = prefetch_type::device);
+
+void prefetch(sycl::handler &h, void* ptr, size_t numBytes,
+              prefetch_type type = prefetch_type::device);
 
 }
 ----
 !====
-_Effects_: Enqueues a `prefetch` to the `sycl::queue` or `sycl::handler`.
+_Effects_: Enqueues a `prefetch` to the `sycl::queue` or `sycl::handler`. The
+`prefetch_type` enum indicates the destination device the USM data is fetched to:
+i.e. a prefetch to `prefetch_type::device` fetches from the host to the device,
+and `prefetch_type::host` fetches from the device back to host.
+
 
 a|
 [frame=all,grid=none]