bug#16292: 24.3.50; info docs now contain single straight quotes instead of `'

[Drew Adams]

> > > This feels like a new feature, so I'm somewhat inclined to leave
> > > this stuff alone in the trunk until after the feature freeze is
> > > over.
> >
> > As long as the regression is fixed, that sounds reasonable.  IOW,
> > we already had a regression from `...' to '...'.
> >
> > IIUC, Eli reverted that regression, restoring `...'.
> 
> No, I didn't, not if Texinfo 5 is used to prepare the Info files.
> In that version of Texinfo, the default is '..'.

My mistake.