Scripting: Fix wrong merge of 4.0 connect syntax

Fixes #3984.

getting_started/step_by_step/scripting.rst

@@ -261,7 +261,7 @@ using :ref:`Object.connect() <class_Object_method_connect>`.
  .. code-tab:: gdscript GDScript
 
     func _ready():
-        get_node("Button").connect("pressed", self._on_Button_pressed)
+        get_node("Button").connect("pressed", self, "_on_Button_pressed")
 
  .. code-tab:: csharp
 
@@ -278,7 +278,7 @@ The final script should look like this:
     extends Panel
 
     func _ready():
-        get_node("Button").connect("pressed", self._on_Button_pressed)
+        get_node("Button").connect("pressed", self, "_on_Button_pressed")
 
     func _on_Button_pressed():
         get_node("Label").text = "HELLO!"