bug#21447: 25.0.50; doc string of `character-fold-search'

[Drew Adams]

> > 1. This should be a defcustom, not a defvar.  But this improvement has
> > apparently already been agreed to (per emacs-devel correspondence).
> >
> > 2. The doc string should treat characters as characters.  It should not
> > just put " and a inline, with no syntax making them stand out.
> >
> > They should be written as `?\"' and `?a'.  Or at least as ?\" and ?a.
> > Or possibly as `"' and `a'.
> >
> > 3. Please replace "(and then some)" by some indication of what is meant
> > by it.  Just say that `?a' also matches other kinds of "a-like"
> > characters, such as <GIVE AN EXAMPLE>.
> 
> I can't find a variable called `character-fold-search'...

It was added to Emacs 25 and then removed.  I will close the bug.