But Emojis which were meant to part of chat messages & tweets are making their way into professional websites. They do add the "informal" / "casual" look to the docs and in some cases help with readiblity... but most of the times they are out of context. Look really ugly on an otherwise well-crafted web page.
They are modern bullet points. They feel like a cheap weird invention that is being used for contexts they weren't designed for.