Update tooltip note in 02.player_scene.rst

The tooltip appears to have been updated since the docs were written.

getting_started/first_2d_game/02.player_scene.rst

@@ -30,8 +30,9 @@ functionality.
 
 Before we add any children to the ``Player`` node, we want to make sure we don't
 accidentally move or resize them by clicking on them. Select the node and click
-the icon to the right of the lock. Its tooltip says "Make selected node's
-children not selectable."
+the icon to the right of the lock. Its tooltip says "Groups the selected node 
+with its children. This causes the parent to be to be selected when any child
+node is clicked in 2D and 3D view."
 
 .. image:: img/lock_children.webp