Nested and mixed lists are an interesting beast. It’s a corner case to make sure that lists within lists do not break the ordered list numbering order and list styles go deep enough.
You’ll find this post in your
_posts directory. Go ahead and edit it and re-build the site to see your changes. You can rebuild the site in many different ways, but the most common way is to run
jekyll serve, which launches a web server and auto-regenerates your site when a file is updated.