bug#12294: 24.2.50; `C-h m' in Buffer Menu - regresssion

[Chong Yidong]

"Drew Adams" <drew.adams@oracle.com> writes:

> Before the doc-string change to Buffer-menu-mode, C-h m told users what
> the mode was actually about and how to use it - which is the purpose of
> C-h m.  It listed important key bindings.
>  
> Now, C-h m tells you how the mode is invoked!  Of course, if you used
> C-h m then it has already been invoked!

Fixed, thanks.