Don't pass invalid parameter to DocFormatter from LongParams

Solves:

lib/jsduck/doc_formatter.rb:24:in `initialize': wrong number of arguments (1 for 0) (ArgumentError)
	from lib/jsduck/long_params.rb:9:in `new'
	from lib/jsduck/long_params.rb:9:in `initialize'
	from lib/jsduck/method_table.rb:16:in `new'
	from lib/jsduck/method_table.rb:16:in `initialize'