missing @ hint on export (typo?) (#5956)

* missing @ hint on export (typo?)
* yield -> await

getting_started/first_2d_game/03.coding_the_player.rst

@@ -30,7 +30,7 @@ Start by declaring the member variables this object will need:
 
     extends Area2D
 
-    export var speed = 400 # How fast the player will move (pixels/sec).
+    @export var speed = 400 # How fast the player will move (pixels/sec).
     var screen_size # Size of the game window.
 
  .. code-tab:: csharp

getting_started/first_2d_game/06.heads_up_display.rst

@@ -211,7 +211,7 @@ temporarily, such as "Get Ready".
     func show_game_over():
         show_message("Game Over")
         # Wait until the MessageTimer has counted down.
-        yield($MessageTimer, "timeout")
+        await($MessageTimer, "timeout")
 
         $Message.text = "Dodge the\nCreeps!"
         $Message.show()