Fix rendering, minor wording changes

- Disallow host_task events in dynamic_events

sycl/doc/extensions/experimental/sycl_ext_oneapi_graph.asciidoc

@@ -1726,8 +1726,8 @@ Exceptions:
 * Throws synchronously with error code `invalid` if this function is called from
 a normal SYCL command-group submission.
 
-* Throws synchronously with error code `invalid` if any of the `sycl::event`s
-associated with `depEvents` came from the same graph that the graph node
+* Throws synchronously with error code `invalid` if any of the `sycl::event`
+objects associated with `depEvents` came from the same graph that the graph node
 resulting from this command-group submission is associated with.
 
 |===
@@ -1806,14 +1806,20 @@ Parameters:
 
 * `syclEvent` - The SYCL event to associate this `dynamic_event` with.
 
+Exceptions:
+
+
+* Throws synchronously with error code `invalid` if `syclEvent` is an event
+returned from enqueuing a `host_task`. 
+
 |
 [source,c++]
 ----
 void update(const event& syclEvent);
 ----
 
-| Updates the SYCL event associated with `dynamic_event`. This update will be
-reflected immediately in the associated modifiable graph nodes. An executable
+| Updates the SYCL event associated with this `dynamic_event`. This update will
+be reflected immediately in the associated modifiable graph nodes. An executable
 graph can then be updated to reflect these new event dependencies using
 <<executable-graph-update, Executable Graph Update>>.
 
@@ -1825,7 +1831,10 @@ Exceptions:
 
 * Throws synchronously with error code `invalid` if `syclEvent` is an event
 obtained from a queue submission which was recorded to the same graph any of the
-`node`s associated with this `dynamic_event` are from.
+`node` objects associated with this `dynamic_event` are from.
+
+* Throws synchronously with error code `invalid` if `syclEvent` is an event
+returned from enqueuing a `host_task`. 
 
 
 |===