Expanded remark in SyclTimer docstring

Author: oleksandr-pavlyk

dpctl/_sycl_timer.py

@@ -46,8 +46,13 @@ class SyclTimer:
             sycl_dt, wall_dt = timer.dt
 
     Remark:
-        The timer synchronizes the queue at the entrance and the
-        exit of the context.
+        The timer submits barriers to the queue at the entrance and the
+        exit of the context and uses profiling information from events
+        associated with these submissions to perform the timing. Thus
+        :class:`dpctl.SyclTimer` requires the queue with "enable_profiling"
+        property. In order to be able to collect the profiling information
+        the property `dt` ensures that both submitted barriers complete
+        their execution and thus effectively synchronizing the queue.
 
     Args:
         host_timer (callable): A callable such that host_timer() returns current