MS GitHub can not only render rST & AsciiDoc (albeit pretty poorly since they the CSS is bad), but it also is employing its own fork of Markdown that isn’t compatible with other forks. “Just Markdown”, like the base spec, is so feature poor that everyone has their own incompatible fork which don’t make it render properly.

console/shell-session/sh-session (parsers call them different names) are for shell sessions, terminal sessions. Bash syntax is for Bash scripts, & these aren’t scripts but something you run in your terminal session.