bug#19209: 25.0.50; doc string of `mwheel-scroll' is incorrect

[Lars Ingebrigtsen <larsi@gnus.org>]

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

> C-h f mwheel-scroll provides contradictory information - on MS Windows,
> at least:
>
>   It is bound to S-wheel-down, wheel-down, S-wheel-up, wheel-up.
>
>   (mwheel-scroll EVENT)
>
>   Scroll up or down according to the EVENT.
>   This should only be bound to mouse buttons 4 and 5.
>
> According to this, Emacs -Q is doing something it "should" not do:
> binding the command to `S-wheel-down', `wheel-down', `S-wheel-up', and
> `wheel-up'.
>
> Please remove the platform-specific sentence that says that this should
> only be bound to `mouse-4' and `mouse-5'.

I've now mentioned that it does not apply to Windows.  (Are we allowed
to mention non-free systems in doc string like this?  If not, feel free
to revert the patch.)

> (That text was anyway worded poorly - it should have said "This should
> be bound only to `mouse-4' and `mouse-5'.")

Fixed.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no