Fix coroutine spawning syntax in base.rfc

Author: EdmondDantes

base.rfc

@@ -687,9 +687,9 @@ class HiPriorityStrategy implements Async\SpawnStrategy
     // Additional methods ...
 }
 
-spawn with new HiPriorityStrategy() {
+spawnWith(new HiPriorityStrategy(), function() {
     // This coroutine will be marked as high priority
-};
+});
 </code>
 
 === ''hiPriority'' strategy ===