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.