[NFC][SYCL] Fix comment. (#2541)

Signed-off-by: Sergey Kanaev <[email protected]>

Author: s-kanaev

sycl/source/detail/scheduler/commands.hpp

@@ -493,10 +493,10 @@ class ExecCGCommand : public Command {
 
   detail::CG &getCG() const { return *MCommandGroup; }
 
-  // MEmptyCmd one is only employed if this command refers to host-task.
-  // MEmptyCmd due to unreliable mechanism of lookup for single EmptyCommand
-  // amongst users of host-task-representing command. This unreliability roots
-  // in cleanup process.
+  // MEmptyCmd is only employed if this command refers to host-task.
+  // The mechanism of lookup for single EmptyCommand amongst users of
+  // host-task-representing command is unreliable. This unreliability roots in
+  // the cleanup process.
   EmptyCommand *MEmptyCmd = nullptr;
 
 private: