No need to explain why you don't understand an answer. If I could make everything perfectly clear on the first attempt I'd be ... unusual.
The example I gave takes a data frame as an argument, so one option is to convert your bullet points into a single column data frame. For HTML, you can use CSS styling with a custom style see § 22.214.171.124 Custom CSS of the docs for YAML header with something like
border: 2px solid #990066;
outline: #990066 solid 5px;
Then, you'd add the HTML mark-up in your text
* keypoint 1
* keypoint 2
The .css style needs to be in your working directory