Adrian Skar 97a74b68e8 [Guide] ES6: Prevent object mutation; fixes and enhancements (#34649)
* [Guide] ES6: Prevent object mutation; fixes and enhancements

- Remove phantom image
- Remove notes for contributors
- Change explanation and hints.
- Links to markdown

* Changed as requested

Changed titles as requested by @randelldawson. 
Note: I'm just used to [MDN](https://developer.mozilla.org/en-US/docs/MDN/Contribute/Guidelines/Writing_style_guide#Page_titles) and other language styles and though it was clearer. Is it ok now for this guide?

* fix: removed repl.it link
2019-03-10 11:07:48 -07:00
..