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This patch fixes the WARNING messages that pops up since Sphinx 5.x:
WARNING: extlinks: Sphinx-6.0 will require a caption string to contain
exactly one '%s' and all other '%' need to be escaped as '%%'.
[1] https://www.sphinx-doc.org/en/master/usage/extensions/extlinks.html
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>