Allow fallback

If true, the command uses mdoc_or_fallback. Default is true.

Property definitions

nitc $ CmdComment :: _fallback
	# Allow fallback
	#
	# If `true`, the command uses `mdoc_or_fallback`.
	# Default is `true`.
	var fallback = true is optional, writable
src/doc/commands/commands_model.nit:27,2--31,42