[2D Game Tutorial] Polished code explanation

Placed it above the code, instead of below. It was bad because "This function" yet it's the code above, so it wasn't even "the above function" lol

Now, the code explanation is above the code, like the rest of the docs, and the eye rolls linearly instead of "what is this" then reading below "aaah!" and reading above again lol

getting_started/first_2d_game/06.heads_up_display.rst

@@ -72,14 +72,14 @@ ScoreLabel
 
 -  *Layout* : "Top Wide"
 -  *Text* : ``0``
--  *Align* : "Center"
+-  *Alignment* : "Center"
 
 Message
 ~~~~~~~~~~~~
 
 -  *Layout* : "HCenter Wide"
 -  *Text* : ``Dodge the Creeps!``
--  *Align* : "Center"
+-  *Alignment* : "Center"
 -  *Autowrap* : "On"
 
 StartButton
@@ -102,6 +102,7 @@ Now add this script to ``HUD``:
 
     extends CanvasLayer
 
+    # Notifies `Main` node that the button has been pressed
     signal start_game
 
  .. code-tab:: csharp
@@ -109,7 +110,7 @@ Now add this script to ``HUD``:
     public class HUD : CanvasLayer
     {
         // Don't forget to rebuild the project so the editor knows about the new signal.
-
+        
         [Signal]
         public delegate void StartGameEventHandler();
     }
@@ -155,8 +156,8 @@ Now add this script to ``HUD``:
 
     #endif // HUD_H
 
-The ``start_game`` signal tells the ``Main`` node that the button
-has been pressed.
+We now want to display a message temporarily, 
+such as "Get Ready", so we add the following code
 
 .. tabs::
  .. code-tab:: gdscript GDScript
@@ -202,8 +203,7 @@ has been pressed.
         godot::register_signal<HUD>("start_game", godot::Dictionary());
     }
 
-This function is called when we want to display a message
-temporarily, such as "Get Ready".
+We also need to process what happens when the player loses. The code below will show "Game Over" for 2 seconds, then return to the title screen and, after a brief pause, show the "Start" button.
 
 .. tabs::
  .. code-tab:: gdscript GDScript
@@ -262,6 +262,8 @@ seconds, then return to the title screen and, after a brief pause, show the
           can be very useful to add delays such as in the above code, where we
           want to wait some time before showing the "Start" button.
 
+Add the code below to ``Main`` to update the score
+
 .. tabs::
  .. code-tab:: gdscript GDScript
 
@@ -282,10 +284,8 @@ seconds, then return to the title screen and, after a brief pause, show the
         _score_label->set_text(godot::Variant(p_score));
     }
 
-This function is called by ``Main`` whenever the score changes.
-
 Connect the ``timeout()`` signal of ``MessageTimer`` and the ``pressed()``
-signal of ``StartButton`` and add the following code to the new functions:
+signal of ``StartButton``, and add the following code to the new functions:
 
 .. tabs::
  .. code-tab:: gdscript GDScript