Adam P. Jenkins wrote:
> Emacs lisp packages typically have the documentation in the elisp
> package itself.  In any emacs buffer, the describe-mode emacs function,
> bound to "C-h m" or "F1 m", gives some documentation for the current
> major and minor modes.  So, if you're editing a a ruby file in emacs and
> run describe-mode, you get documentation for ruby-mode, which includes
> keybindings.
>
> Adam

When I tried that, shortly pefore posting my original question, it gave
me an error message about not being able to access the file containing
the documentation. The problem seems to have gone away, maybe as a
result of restarting Emacs.