[BUG] org-fast-tag-selection-include-todo is documented in the manual, but its docstring says that it is undocumented [9.7-pre (release_9.6.15-1039-gc00217 @ /home/yantar92/.emacs.d/straight/build/org/)]

[Ihor Radchenko]

Hi,

According to the docstring, `org-fast-tag-selection-include-todo':

    Non-nil means fast tags selection interface will also offer TODO states.
    This is an undocumented feature, you should not rely on it.

Yet, in the manual, we have

    [fn:15] Check also the variable ~org-fast-tag-selection-include-todo~,
    it allows you to change the TODO state through the tags interface (see
    [[*Setting Tags]]), in case you like to mingle the two concepts.  Note
    that this means you need to come up with unique keys across both sets
    of keywords.

We should either remove `org-fast-tag-selection-include-todo' from the
manual, or make it into a proper defcustom.

I am leaning towards removing the mention from the manual, but would
like to hear from others.

Is anyone using org-fast-tag-selection-include-todo? Does anyone think
that documenting it properly would be useful?

Emacs  : GNU Emacs 30.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.24.38, 
cairo version 1.18.0)
 of 2024-01-07
Package: Org mode version 9.7-pre (release_9.6.15-1039-gc00217 @ 
/home/yantar92/.emacs.d/straight/build/org/)
-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
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