Description of diff style is incorrect in Quick Start

[kategengler]

https://guides.emberjs.com/release/getting-started/quick-start/ [here in code] (https://github.com/ember-learn/guides-source/blob/master/guides/release/getting-started/quick-start.md?plain=1#L257 ) describes the diff style:

In the rest of the code examples in this tutorial, whenever we add or remove code, we will show a "diff." The lines you need to remove have a minus sign in front of them, and the lines you should add have a plus sign. If you are using a screen reader while you go through the Guides, we recommend using Firefox and NVDA or Safari and VoiceOver for the best experience.

However, the diffs display only with colors:

There are no pluses or minuses in the elements either.

I suspect this may not be accessible to those with colorblindness.