bug#52053: 29.0.50; Nonsensical button "C-x C-f" in scratch buffer

[Robert Pluim]

>>>>> On Fri, 26 Nov 2021 08:26:54 +0200, Eli Zaretskii <eliz@gnu.org> said:

    >> Date: Thu, 25 Nov 2021 22:45:02 +0000
    >> From: Gregory Heytings <gregory@heytings.org>
    >> cc: luangruo@yahoo.com, larsi@gnus.org, 52053@debbugs.gnu.org
    >> 
    >> Updated patch attached.

    Eli> Thanks.  This approach is fine by me, but the variable you introduced
    Eli> should not be internal, and it probably should be called out in NEWS
    Eli> (in the Lisp section), because I believe the intent was to allow other
    Eli> callers to use it, even though currently we have only one such caller.

So a variable that code can set to say 'use this other variable'?
Again, why not just bind `help-link-key-to-documentation' directly?

Robert
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