docs: Fix conf.py for Sphinx 2.0
commit 3bc8088464712fdcb078eefb68837ccfcc413c88 upstream. Our version check in Documentation/conf.py never envisioned a world where Sphinx moved beyond 1.x. Now that the unthinkable has happened, fix our version check to handle higher version numbers correctly. Cc: stable@vger.kernel.org Signed-off-by: NJonathan Corbet <corbet@lwn.net> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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