Correct spelling for “strictly”

Author: knowler

learn/components/defining-a-component.md

@@ -3,7 +3,7 @@ title: Defining a Component
 order: 1
 ---
 
-Most components you write will need some kind of JavaScript. While it's not _stricly_ necessary, more often than not
+Most components you write will need some kind of JavaScript. While it's not _strictly_ necessary, more often than not
 you'll want to add JavaScript to provide logic. To do this you'll need to create a JavaScript `class`, and use the
 "Custom Elements Registry" to attach your class so the browser knows to use it.