Fix typo in comment (#10021)

examples/js/controls/OrbitControls.js

@@ -11,7 +11,7 @@
 //
 //    Orbit - left mouse / touch: one finger move
 //    Zoom - middle mouse, or mousewheel / touch: two finger spread or squish
-//    Pan - right mouse, or arrow keys / touch: three finter swipe
+//    Pan - right mouse, or arrow keys / touch: three finger swipe
 
 THREE.OrbitControls = function ( object, domElement ) {