Add some code highlighting

seed/challenges/automated-testing-and-debugging.json

@@ -30,10 +30,10 @@
         "typeof is a useful method that we can use to check the type of a variable",
         "One thing to be careful of is that an array has the type objects",
         "Try using each of these to see the types they have",
-        "console.log(typeof(\"\"));",
+        "<code>console.log(typeof(\"\"));",
         "console.log(typeof(0));",
         "console.log(typeof([]));",
-        "console.log(typeof({}));"
+        "console.log(typeof({}));</code>"
       ],
       "tests":[
         "assert(editor.getValue().match(/console\\.log\\(typeof\\(\"\"\\)\\);/gi), 'You should console.log the typeof a string');",