Update JavaScript for...in syntax block

[Jinksi]

Add missing angled brackets ({ }) missing from for...in syntax example.

What was wrong/why is this fix needed? (quick summary only)

Angled brackets ({ }) were missing from the JavaScript for...in syntax example.

MDN URL of the main page changed

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in

Issue number (if there is an associated issue)

N/A

Anything else that could help us review it

I am matching the HTML and code snippet example of the for...of page:

for...of MDN page

for...of syntax HTML format:

content/files/en-us/web/javascript/reference/statements/for...of/index.html

Lines 27 to 30 in f9d7104

	<pre class="brush: js">for (<var>variable</var> of <var>iterable</var>) {
	<var>statement</var>
	}
	</pre>

[wbamberg]

@Elchi3 , what should the syntax section look like for this kind of language feature?

[github-actions]

Preview URLs

• https://pr5079.content.dev.mdn.mozit.cloud/en-US/docs/Web/JavaScript/Reference/Statements/for...in

Flaws

URL: /en-US/docs/Web/JavaScript/Reference/Statements/for...in
Title: for...in
on GitHub
Flaw count: 1

• macros:
  • /en-US/docs/Web/JavaScript/Reference/Statements/for_each...in does not exist

External URLs

URL: /en-US/docs/Web/JavaScript/Reference/Statements/for...in
Title: for...in
on GitHub

No new external URLs

[Jinksi]

@wbamberg I believe it should look like the for...of example, simply including the angled brackets, example below:

(Edit: I see you were mentioning @Elchi3)

[sideshowbarker]

Gonna go ahead and land this, since as noted in the description and at #5079 (comment), this is making it consistent with how we currently format the for...of Syntax.

So if we decide we need to do something different than this for the Syntax sections, we can change it later — in both places.

[sideshowbarker]

Eric, thanks much, and congrats on landing your first docs change here — welcome aboard 🎉

[Jinksi]

@sideshowbarker thanks heaps, glad to help out!