docs: can.rst: fix a footnote reference
As stated at: http://www.sphinx-doc.org/en/master/usage/restructuredtext/basics.html#footnotes A footnote should contain either a number, a reference or an auto number, e. g.: [1], [#f1] or [#]. While using [*] accidentaly works for html, it fails for other document outputs. In particular, it causes an error with LaTeX output, causing all books after networking to not be built. So, replace it by a valid syntax. Acked-by: NOliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: NJonathan Corbet <corbet@lwn.net>
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