Remove error handling paragraph

sycl/doc/extensions/experimental/sycl_ext_oneapi_graph.asciidoc

@@ -1666,13 +1666,6 @@ being thrown in the default queue executing state, will still be thrown when a
 queue is in the recording state. Queue query methods operate as usual in
 recording mode, as opposed to throwing.
 
-The `command_graph::begin_recording` and `command_graph::end_recording`
-entry-points return a `bool` value informing the user whether a related queue
-state change occurred. False is returned rather than throwing an exception when
-no queue state is changed. This design is because the queues are already in
-the state the user desires, so if the function threw an exception in this case,
-the application would likely swallow it and then proceed.
-
 === Interaction With Other Extensions [[extension-interaction]]
 
 This section defines the interaction of `sycl_ext_oneapi_graph` with other