bug#4257: Documentation for where-is-preferred-modifier is obscure

[Lars Magne Ingebrigtsen <larsi@gnus.org>]

Alan Mackenzie <acm@muc.de> writes:

> The doc string for `where-is-preferred-modifier' is
>
>    where-is-preferred-modifier is a variable defined in `C source code'.
>    Its value is nil
>
>    Documentation:
>    Preferred modifier to use for `where-is'.
>    When a single binding is requested, `where-is' will return one that
>    uses this modifier if possible.  If nil, or if no such binding exists,
>    bindings using keys without modifiers (or only with meta) will be
>    preferred.
>
> .  This leaves the user having to guess what a "modifier for `where-is'"
> is.  This is bad.

By "modifier" they mean a modifier key.  I've now clarified this in the
doc string in Emacs 24.

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