bug#33382: 26; doc string of `abbrev-prefix-mark'

[Lars Ingebrigtsen]

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

> (Minor)
>
> The doc string says that the command inserts a temporary hyphen,
> temporary until the intended abbrev expansion occurs.
>
> It might be better to say that it inserts a hyphen, and to add that if
> the command is later followed by an abbrev expansion then this hyphen is
> removed.  That clearly says what _this_ command does, and separates that
> from other changes that might come later from other commands.  (If you
> don't follow `M-'' with abbrev expansion then the hyphen is not
> removed.)

Makes sense; I've now done this on the trunk.

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