Update content/docs/reference-javascript-environment-requirements.md

Co-Authored-By: cvqprs <cvqprs@gmail.com>

Author: jakubdrozdek

content/docs/reference-javascript-environment-requirements.md

@@ -18,7 +18,7 @@ import React from 'react';
 import ReactDOM from 'react-dom';
 
 ReactDOM.render(
-<h1>Witaj, świecie!</h1>,
+  <h1>Witaj, świecie!</h1>,
 document.getElementById('root')
 );
 ```