[SYCL][Bindless] Fix bindless spec stating certain copies are unsupported (#17507)

USM device to device copies are supported. In addition, host to host
image copies are supported.

Author: DBDuncan

sycl/doc/extensions/experimental/sycl_ext_oneapi_bindless_images.asciidoc

@@ -1232,16 +1232,14 @@ public:
 }
 ```
 
-To enable the copying of images an `ext_oneapi_copy` function is proposed as a 
-method of the queue and handler. It can be used to copy image memory, whether 
-allocated through USM or using an `image_mem_handle`, from host to 
-device, or device to host. Device to device copies are currently supported only 
-through `image_mem_handle` allocations. 
-For the `ext_oneapi_copy` variants that do not take 
-offsets and extents, the image descriptor passed to the `ext_oneapi_copy` API 
-is used to determine the pixel size, dimensions, and extent in memory of the 
-image to copy. If performing sub-region copy, the size of the memory region is 
-also determined by the offsets and extent passed.
+To enable the copying of images an `ext_oneapi_copy` function is proposed as a
+method of the queue and handler. It can be used to copy image memory, whether
+allocated through USM or using an `image_mem_handle`, from host to device,
+device to host, device to device or host to host. For the `ext_oneapi_copy`
+variants that do not take offsets and extents, the image descriptor passed to
+the `ext_oneapi_copy` API is used to determine the pixel size, dimensions, and
+extent in memory of the image to copy. If performing sub-region copy, the size
+of the memory region is also determined by the offsets and extent passed.
 
 For images allocated using USM, existing SYCL functionality can be used to 
 copy their memory, but we also provide `ext_oneapi_copy` functions that take