docs: kerneldoc-preamble.sty: Remove code for Sphinx <2.4
Now that Sphinx 2.4.4 or better is required, get rid of \providecommand{}'s for compatibility with Sphinx 1.7.9. While at it, reword the comment on \sphinxtableofcontentshook for better description of why it needs to be emptied. Signed-off-by: Akira Yokosawa <akiyks@gmail.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <ed1ec6f2-0050-46f6-807d-8679f26427e9@gmail.com>
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