Comment by dspillett

Both predate common use of LLMs, unless my memory is even more shaky than usual on this. I'm sure I saw them appear a fair amount on GitHub and related project pages, but I couldn't tell you more specifically how they started & grew.

Somehow they must have been over-represented in the training data (or something in the tokenising/training/other processes magnifies the effective presence of punctuation) because I don't remember them being that common and LLMs seem to love spewing them out. Or perhaps it is a sign of the Habsburg problem: people asked LLMs to produce README files like that because they'd seen the style elsewhere, it having spread more organically at first, and the timing was just right for lots of those early examples to get fed back into training data for subsequent models.