[SYCL][Graph][Doc] Update spec supported features

The following features are defined in the specification as unsupported, but
have working implementations merged upstream. This PR updates the graphs
specification to reflect that and removes some trailing whitespace.

* intel#11418
* intel#11505
* intel#11556
* intel#11855

Author: EwanC

sycl/doc/extensions/experimental/sycl_ext_oneapi_graph.asciidoc

@@ -486,10 +486,10 @@ class depends_on {
 }
 ----
 
-==== Depends-On-All-Leaves Property 
+==== Depends-On-All-Leaves Property
 The API for explicitly adding nodes to a `command_graph` includes a
-`property_list` parameter. This extension defines the `depends_on_all_leaves` 
-property to be passed here. `depends_on_all_leaves` provides a shortcut for 
+`property_list` parameter. This extension defines the `depends_on_all_leaves`
+property to be passed here. `depends_on_all_leaves` provides a shortcut for
 adding all the current leaves of a graph as dependencies.
 [source,c++]
 ----
@@ -757,11 +757,11 @@ print_graph(std::string path, bool verbose = false) const;
 ----
 
 |Synchronous operation that writes a DOT formatted description of the graph to the
-provided path. By default, this includes the graph topology, node types, node id, 
-and kernel names. 
-Verbose can be set to true to write more detailed information about each node type 
+provided path. By default, this includes the graph topology, node types, node id,
+and kernel names.
+Verbose can be set to true to write more detailed information about each node type
 such as kernel arguments, copy source, and destination addresses.
-At the moment DOT format is the only supported format. The name of hte output file 
+At the moment DOT format is the only supported format. The name of the output file
 must therefore match this extension, i.e. "<filename>.dot".
 
 Parameters:
@@ -772,7 +772,7 @@ or memory access where applicable.
 
 Exceptions:
 
-* Throws synchronously with error code `invalid` if the path is invalid or 
+* Throws synchronously with error code `invalid` if the path is invalid or
 the file extension is not supported or if the write operation failed.
 
 |===
@@ -1220,11 +1220,12 @@ passed an invalid event.
 
 The new handler methods, and queue shortcuts, defined by
 link:../supported/sycl_ext_oneapi_enqueue_barrier.asciidoc[sycl_ext_oneapi_enqueue_barrier]
-cannot be used in graph nodes. A synchronous exception will be thrown with
-error code `invalid` if a user tries to add them to a graph.
-
-Removing this restriction is something we may look at for future revisions of
-`sycl_ext_oneapi_graph`.
+can only be used in graph nodes created using the Record & Replay API, as
+barriers rely on events to enforce dependencies. A synchronous exception will be
+thrown with error code `invalid` if a user tries to add them to a graph using
+the Explicit API. Empty nodes created with the `node::depends_on_all_leaves`
+property can be used instead of barriers when a user is building a graph with
+the explicit API.
 
 ==== sycl_ext_oneapi_memcpy2d
 
@@ -1793,12 +1794,14 @@ if used in application code.
 . Using `handler::memset` in a graph node.
 . Using `handler::prefetch` in a graph node.
 . Using `handler::memadvise` in a graph node.
-. Using specialization constants in a graph node.
 . Using reductions in a graph node.
 . Using sycl streams in a graph node.
-. Using a kernel bundle in a graph node.
 . Profiling an event returned from graph submission with
   `event::get_profiling_info()`.
+. Level Zero immediate command-lists are not supported, and
+  `sycl::ext::intel::property::queue::no_immediate_command_list`
+  should be set on construction to any queues an executable
+  graph is submitted to.
 
 == Revision History