'constructor' typo in migration from javascript tutorial

Author: nathanfrancy

pages/tutorials/Migrating from JavaScript.md

@@ -391,7 +391,7 @@ For instance, imagine a `Point` class, and imagine a function that we wish to ad
 
 ```ts
 class Point {
-    constuctor(public x, public y) {}
+    constructor(public x, public y) {}
     getDistance(p: Point) {
         let dx = p.x - this.x;
         let dy = p.y - this.y;