Doc edit suggestion in '05.the_main_game_scene.rst' to avoid confusion (#5623)

* change "Use Snap" to "Use Smart Snap"

* highlight "Use Smart Snap" icon

getting_started/first_2d_game/05.the_main_game_scene.rst

@@ -47,7 +47,7 @@ see some new buttons at the top of the editor:
 
 Select the middle one ("Add Point") and draw the path by clicking to add the
 points at the corners shown. To have the points snap to the grid, make sure "Use
-Grid Snap" and "Use Snap" are both selected. These options can be found to the
+Grid Snap" and "Use Smart Snap" are both selected. These options can be found to the
 left of the "Lock" button, appearing as a magnet next to some dots and
 intersecting lines, respectively.