Added keymaps to help strings of rspec-mode, et. al

I don't use ruby and rspec-mode much and I can't remember the keymaps so I added them to the documentation strings.
You might not like my changes.  There is some magic I don't understand with \\{foo-mode-map}.  The keymap, it appears, must be named foo-mode-keymap for the magic to work.  \\{foo-mode-map} gives me the complete path to each function whereas \\{foo-mode-keymap} only gives me the last key stroke.
In any case, to make the magic work, I had to change rspec-mode-verifiable-keymap to rspec-verifiable-mode-keymap because the mode is rspec-verifiable-mode -- not rspec-mode-verifiable.
yes.  sorry

Should be fixed now?  I'm not sure how pull requests work.

On Oct 4, 2014, at 8:44 PM, Dmitry Gutov <notifications@github.com> wrote:

> In rspec-mode.el:
> 
> >  
> >  ;;;###autoload
> >  (define-minor-mode rspec-dired-mode
> > -  "Minor mode for Dired buffers with spec files"
> > +  "Minor mode for Dired buffers with spec files
> > +
> > +\\{rspec-dired-mode-map"
> Missing closing brace?
> 
> —
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