Update article.md

Make the example a bit more inclusive.

Author: super-salad

1-js/05-data-types/12-json/article.md

@@ -41,7 +41,7 @@ let student = {
   age: 30,
   isAdmin: false,
   courses: ['html', 'css', 'js'],
-  wife: null
+  spouse: null
 };
 
 *!*
@@ -58,7 +58,7 @@ alert(json);
   "age": 30,
   "isAdmin": false,
   "courses": ["html", "css", "js"],
-  "wife": null
+  "spouse": null
 }
 */
 */!*