Add spec error for finalize exception

Author: Ewan Crawford

sycl/doc/design/CommandGraph.md

@@ -609,7 +609,7 @@ OpenCL UR adapter based on
 the presence of `cl_khr_command_buffer`, and the OpenCL device reporting
 support for
 [CL_COMMAND_BUFFER_CAPABILITY_SIMULTANEOUS_USE_KHR](https://registry.khronos.org/OpenCL/specs/3.0-unified/html/OpenCL_API.html#CL_COMMAND_BUFFER_CAPABILITY_SIMULTANEOUS_USE_KHR).
-The later is required to enable multiple submissions of the same executable
+The latter is required to enable multiple submissions of the same executable
 `command_graph` object without having to do a blocking wait on prior submissions
 in-between.
 

sycl/doc/extensions/experimental/sycl_ext_oneapi_graph.asciidoc

@@ -1347,6 +1347,11 @@ Parameters:
   The other is <<enable-profiling, `property::graph::enable_profiling`>>
   to enable profiling events returned from submissions of the executable graph.
 
+Exceptions:
+
+* Throws synchronously with error code `feature_not_supported` if the graph
+  contains a command that is not supported by the device.
+
 Returns: A new executable graph object which can be submitted to a queue.
 
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