bug#1553: 23.0.60; footnote-mode confusion

[Leo]

Hi there,

The description of footnote-mode says:

,----
| Toggle footnote minor mode.
| 
| This minor mode provides footnote support for `message-mode'.  To get
| started, play around with the following keys:
`----

but actually by default footnote-mode add all its bindings in
footnote-mode-map to the global map i.e. once it is called all its
bindings are available globally regardless of major modes. So I think
the doc string of footnote-mode should be improved to reflect this
fact. It seems pointless to mention message-mode in this case.

Best wishes,

Leo.