Fix typo: "intantiated" -> "instantiated" (#5810)

getting_started/step_by_step/signals.rst

@@ -224,7 +224,7 @@ We need to do two operations to connect the nodes via code:
           method of the node you want to listen to. In this case, we want to
           listen to the Timer's "timeout" signal.
 
-We want to connect the signal when the scene is intantiated, and we can do that
+We want to connect the signal when the scene is instantiated, and we can do that
 using the :ref:`Node._ready() <class_Node_method__ready>` built-in function,
 which is called automatically by the engine when a node is fully instantiated.