Remove autoformatting from IIFE code block

Translations/Chinese/questions/javascript-questions.md

@@ -125,7 +125,8 @@ IIFE（Immediately Invoked Function Expressions）代表立即执行函数。 Ja
 
 你可能会用到 `void` 操作符：`void function foo(){ }();`。但是，这种做法是有问题的。表达式的值是`undefined`，所以如果你的 IIFE 有返回值，不要用这种做法。例如：
 
-```js
+```
+// Don't add JS syntax to this code block to prevent Prettier from formatting it.
 const foo = void function bar() { return 'foo'; }();
 
 console.log(foo); // undefined

questions/javascript-questions.md

@@ -125,7 +125,8 @@ Here are two ways to fix it that involves adding more brackets: `(function foo()
 
 You might also use `void` operator: `void function foo(){ }();`. Unfortunately, there is one issue with such approach. The evaluation of given expression is always `undefined`, so if your IIFE function returns anything, you can't use it. An example:
 
-```js
+```
+// Don't add JS syntax to this code block to prevent Prettier from formatting it.
 const foo = void function bar() { return 'foo'; }();
 
 console.log(foo); // undefined