Inconsistency in the result from substitute-command-keys

[Lennart Borgman]

When doing this

     (insert (substitute-command-keys
              "To scroll help use \\[scroll-other-window-down] and 
\\[scroll-other-window].\n\n")))

I get

    To scroll help use <M-prior> and C-M-v.

It looks a bit inconsistent. If check with C-h w it looks ok:

   scroll-other-window-down is on <M-prior>, C-M-S-v, ESC <prior>
   scroll-other-window is on <M-next>, C-M-v, ESC <next>