Fixed typo in overlay instructions

Author: kjav

3d/ik/fps_example.tscn

@@ -462,7 +462,7 @@ margin_top = 10.0
 margin_right = 1012.0
 margin_bottom = 41.0
 text = "Example use case: Dynamic FPS Animations
-Controls: WASD/Arrows to move, left click to fire, right click to look down sighs, Q/E to lean left/right
+Controls: WASD/Arrows to move, left click to fire, right click to look down sights, Q/E to lean left/right
 Escape to free/lock mouse cursor"
 align = 1
 valign = 1