fix: correct function expression in var article.md en #3914

Original file line number	Diff line number	Diff line change
Expand Up		@@ -227,7 +227,7 @@ An IIFE looks like this:

		Here, a Function Expression is created and immediately called. So the code executes right away and has its own private variables.

	The Function Expression is wrapped with parenthesis `(function {...})`, because when JavaScript engine encounters `"function"` in the main code, it understands it as the start of a Function Declaration. But a Function Declaration must have a name, so this kind of code will give an error:
	The Function Expression is wrapped with parenthesis `(function() {...})`, because when JavaScript engine encounters `"function"` in the main code, it understands it as the start of a Function Declaration. But a Function Declaration must have a name, so this kind of code will give an error:

		```js run
		// Tries to declare and immediately call a function
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