bug#35163: 25.1; `narrow-to-region' docstring no mention of args

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Cc: 35163@debbugs.gnu.org
> Date: Mon, 08 Apr 2019 12:24:58 -0400
> 
> OP wants every doc string to literally contain the upper-case argument
> names, ie START and END in this case (as per eg checkdoc's "Argument ...
> should appear (as ...) in the doc string"). If you agree, it's a trivial
> change. If not, close as wontfix.

Thanks, fixed.

> (People who have particular ideas about doc strings could save everyone
> a lot of time by sending patches.)

Or at least a clear description of the problem.