fix code sample bug (#4238)

Closes #4224

Incorrect `settime-out` replaced with `window.setTimeout`.

---------

Co-authored-by: Kenneth G. Franqueiro <kfranqueiro@users.noreply.github.com>
Co-authored-by: Mike Gower <mikegower@gmail.com>

Author: 3 people

techniques/failures/F50.html

@@ -14,13 +14,13 @@
   // blink "on" state
   function show(){
       document.getElementById("blink1").style.visibility = "visible";
-      settime-out("hide()", 450);
+      window.setTimeout(hide, 450);
    }
 
    // blink "off" state
    function hide(){
       document.getElementById("blink1").style.visibility = "hidden";
-      settime-out("show()", 450);
+      window.setTimeout(show, 450);
    }
 
    // kick it off
@@ -42,4 +42,4 @@
    </section><section id="related"><h2>Related Techniques</h2><ul>
       <li><a href="../client-side-script/SCR22">SCR22</a></li>
    </ul></section>
-</body></html>
+</body></html>