Alternative Header Syntax Should be Noted in Comment Formatting

Weird little formatting issue I noticed, but a Horizontal Reference line appears to cause items to be headers/larger font if too close to the horizontal reference line, and won't display the horizontal reference line.

Too Close

Too Close

Just Right

Just Right

EDIT - As I have been told, it's because of an alternative way of marking headers in markdown, but this alternative way isn't noted in the Comment Formatting page, so perhaps should be to avoid confusion?