bug#51271: Typo's in Emacs documentation

[Eli Zaretskii]

> Cc: "51271@debbugs.gnu.org" <51271@debbugs.gnu.org>
> Date: Sun, 14 Nov 2021 16:05:44 +0000
> From:  "morzahavi@me.com" via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> You didn’t fix it

Stefan did fix it.  But I reverted the fix, because the original
wording was not a mistake, it's correct English.  I added a comment
there explaining why it is correct and even better than the "fixed"
one.

Thanks.