Correct a code example

[hanyujie2002]

In the original code example, g() is called before f() being done.

[jakebailey]

The code is correct as-witten; functions are hoisted and can be called before they appear to be declared.

[hanyujie2002]

TypeScript-Website/packages/documentation/copy/en/reference/Variable Declarations.md

Lines 56 to 75 in 26343c8

	At any point that `g` gets called, the value of `a` will be tied to the value of `a` in `f`.
	Even if `g` is called once `f` is done running, it will be able to access and modify `a`.
	```ts
	function f() {
	var a = 1;
	a = 2;
	var b = g();
	a = 3;
	return b;
	function g() {
	return a;
	}
	}
	f(); // returns '2'
	```

True the code is legitimate. But it is not in line with the text above. In the code example, g() was supposed to be called after f() being done.