bug#40697: 25.3; sort-lines not accepting reverse parameter

[Eli Zaretskii]

> Cc: stepnem@gmail.com, 40697@debbugs.gnu.org
> From: Roland Hughes <roland@logikalsolutions.com>
> Date: Sat, 18 Apr 2020 14:48:19 -0500
> 
> The wording in the help text is rather expert friendly. A user coming in 
> cold to Emacs is going to interpret "prefix argument" as
> 
> [GOLD]-7 REVERSE sort-lines [RETURN]

I can only say that I used the terminology and style that are used
everywhere in our doc strings.