It seems that at some point the Discourse had a favorites
feature, and it somehow still lingers in the default FAQ.
Discourse provides tools that enable the community to collectively identify the best (and worst) contributions: favorites, bookmarks, likes, flags, replies, edits, and so forth. Use these tools to improve your own experience, and everyone else’s, too.
It is also possible that somehow we have an old version of FAQ, in which case I apologize for a false report (but I checked and it is on META as well).