fix copy-paste error: 0, 1 or 2 => 0, 1, 2 or 3

docs/api/math/Vector4.html

@@ -176,7 +176,7 @@ var d = a.dot( b );
 
 		<h3>[method:Float getComponent]( [page:Integer index] )</h3>
 		<div>
-		[page:Integer index] - 0, 1 or 2.<br /><br />
+		[page:Integer index] - 0, 1, 2 or 3.<br /><br />
 
 		If index equals 0 returns the [page:.x x] value. <br />
 		If index equals 1 returns the [page:.y y] value. <br />