bug#66264: Disable warning about wide doc strings by default

[Eli Zaretskii]

> Cc: Stefan Kangas <stefankangas@gmail.com>, "T.V Raman" <raman@google.com>
> From: Mattias Engdegård <mattias.engdegard@gmail.com>
> Date: Fri, 29 Sep 2023 14:59:09 +0200
> 
> This is a proposal to disable the warning about doc string line length by 
> default.

Thanks, but I'm against this change.  It has been, and continues to
be, tremendously useful in making sure our doc strings are in a good
shape.  I don't see how leaving this on only in "Emacs builds" is TRT,
since this means ELPA packages will be exempt from the same scrutiny,
and it also means that byte-compiling a file manually (i.e. not via
lisp/Makefile) will not produce this warning.  I think the small
annoyance of some people about overly-long doc strings produced by
macros is not a sufficient reason to turn this off by default, and
that those who are annoyed can turn it off in their configurations.