Render the message as a HTML string

Property definitions

	# Render the message as a HTML string
	fun to_md: Writable is abstract

src/doc/templates/md_commands.nit:34,2--35,32

	redef fun to_md do return "**Error: {to_s}**"

src/doc/templates/md_commands.nit:39,2--46

	redef fun to_md do return "**Warning: {to_s}**"

src/doc/templates/md_commands.nit:43,2--48