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

[Mattias Engdegård]

This is a proposal to disable the warning about doc string line length by 
default.

While it is a useful warning, it does not actually indicate that anything may 
be wrong in the code, nor that the doc string would risk being misinterpreted 
by the user. It is rather a stylistic complaint, such as the ones produced by 
checkdoc.

There have been complaints about the warning being difficult to avoid in code 
where the doc string is generated by macros, sometimes outside the control of 
the programmer. See 
https://lists.gnu.org/archive/html/emacs-devel/2023-09/msg01326.html for one 
such recent discussion.

For this reason I'm proposing that it be disabled by default but remain enabled 
in builds of Emacs itself, like the warning about curved single quotes.
Patch attached.

docstrings-wide.diff
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