bug#31815: 27.0; Inappropriate use of curly quotes in `info.el'

[Eli Zaretskii]

> Date: Wed, 13 Jun 2018 10:31:00 -0700 (PDT)
> From: Drew Adams <drew.adams@oracle.com>
> 
> In `info.el' there are three occurrences of this (these are curly quotes,
> in case that doesn't come through in the bug-report system):
> 
>   Index for '%s'
> 
> They were all changed from this text:
> 
>   Index for `%s'
> 
> The latter text should be restored.

I don't understand what's so special in these 3 occurrences.  Info
buffers are full of curly quotes; the commands that use the above
generate Info buffers from portions of other Info buffers, and add a
header line.  So why should the header lines use different style of
quotes from the rest of the buffer?