Why is it useful to remove this information? The documentation of the
spell-checkers themselves leaves a lot to be desired, so asking the
users to go consult it might not be appreciated. I'd rather add here
the missing info about the other spellers.
> * lisp/textmodes/ispell.el (ispell-version): Since ispell.el is now
> firmly part of Emacs, and the version hasn’t changed since 2003, and
> isn’t used anywhere, remove it. 3rd-party code can better use the
> Emacs version, or feature or function checks.
I agree, but instead of removing the information, how about replacing
it with the Emacs version? Something like "ispell.el from Emacs %s".