Fix broken syntax files

src/data/question-groups/javascript/content/css-selectors-javascript.md

@@ -19,4 +19,5 @@ const styleP = document.getElementById("styleP");
 styleP.style.color = "red"; 
 styleP.style.border = "3px solid black";
 
-console.log(styleP.style); 
+console.log(styleP.style);
+``` 

src/data/question-groups/javascript/content/iife.md

@@ -13,4 +13,5 @@ Immediately invoked function expressions, or IIFEs, run as soon as they're creat
   console.log(
     "roadmap.sh helps prepare for  JavaScript job interview questions"
   );
-})(); 
+})();
+``` 

src/data/question-groups/javascript/content/imports-exports.md

@@ -24,4 +24,5 @@ export function studyJs(course) {
 
 import { studyJs } from './app.js';
 
-console.log(studyJs("roadmap.sh")); // Read the JavaScript guide on, roadmap.sh 
+console.log(studyJs("roadmap.sh")); // Read the JavaScript guide on, roadmap.sh
+``` 

src/data/question-groups/javascript/content/strict-mode.md

@@ -30,4 +30,5 @@ console.log(courseNumber ); // code won't run
 
 } 
 
-strictExample(); // ReferenceError 
+strictExample(); // ReferenceError
+```