bug#49278: 28.0.50; Lisp Mode is for Common Lisp

[Eli Zaretskii]

> From: João Távora <joaotavora@gmail.com>
> Date: Wed, 30 Jun 2021 14:32:40 +0100
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 49278@debbugs.gnu.org
> 
> On Wed, Jun 30, 2021 at 2:29 PM Eli Zaretskii <eliz@gnu.org> wrote:
> > Fix what? what is the problem?
> 
> The docstring is misleading!

Your changes were not only for the doc string.  But if you want to
focus on the doc string, would the following be okay?

  Major mode for editing programs in Common Lisp and other similar Lisps.