javascript-101/testing-type: format type correctly

Closes jquerygh-595

Author: arthurvr

page/javascript-101/testing-type.md

@@ -5,7 +5,7 @@
 	"attribution": [ "jQuery Fundamentals" ]
 }</script>
 
-JavaScript offers a way to test the type of a variable. However, the result can be confusing – for example, the type of an array is "Object."
+JavaScript offers a way to test the type of a variable. However, the result can be confusing – for example, the type of an array is `object`.
 
 It's common practice to use the `typeof` operator when trying to determining the type of a specific value.