fix typo

Author: LindsayElia

01 - JavaScript Drum Kit/index-START.html

@@ -91,7 +91,7 @@
       - html5 media elements (audio) have a currentTime method as well as many other methods
       - Element.classList has an add, remove, and toggle method which looks just as easy
       to use as using jquery's addClass method
-      - transitions are events that I can listen for https://developer.mozilla.org/en-US/docs/Web/Events/transitionend. Similaryly, can also listen for animations using the animation end event. 
+      - transitions are events that I can listen for https://developer.mozilla.org/en-US/docs/Web/Events/transitionend. Similarly, can also listen for animations using the animation end event. 
   */
   /*
   misc: