RDoc's SimpleMarkup  doesn't catch all the cases of  inline markup
that is really useful for a Ruby documentation. I think it's checking
for \w+ only, but adding some other punctuation marks would be
helpful. Namely, none of the following work b/c of punctuation marks:

  +ActiveRecord::Base+

  +merge!+

  +is_a?+

  +name=+

  +object.call+

It would great if the Regexp could be expanded to catch these cases.

Thanks.