[PATCH V2] histedit: improve error when run on nodes with children (issue5056)

[timeless]

On Tue, Mar 1, 2016 at 1:03 AM, Sean Farley <sean at farley.io> wrote:
>
>> +            raise error.Abort(_('can only histedit a changeset together '
>> +                                'with all descendants'))

It should be `all its`