Explicitly mention to which node should connect the signals (#9153)

* Explicitly mention to which node should connect the signals

Co-authored-by: A Thousand Ships <[email protected]>
(cherry picked from commit 4be049f96777351d8faa114fbe283a824d566dd7)

getting_started/first_2d_game/06.heads_up_display.rst

@@ -185,7 +185,7 @@ Add the code below to ``HUD`` to update the score
     }
 
 Connect the ``pressed()`` signal of ``StartButton`` and the ``timeout()``
-signal of ``MessageTimer``, and add the following code to the new functions:
+signal of ``MessageTimer`` to the ``HUD`` node, and add the following code to the new functions:
 
 .. tabs::
  .. code-tab:: gdscript GDScript