doc: harmonize fenced code snippet flags
We had a few code snippets that were using a non-descriptive tag (e.g. console
or text
), whereas the actual language it's using describes it better, and improves the syntax highlighting. This PR also removes non-necessary leading chars (e.g. $
, >
, or %
) to make it easier for readers to copy and paste to try the command themselves.
/cc @alexsch01