docs-rst: Fix an warning when in interactive mode
When XeLaTeX is in interactive mode, it complains that py@noticelength already exists. Rename it and declare it only once to avoid such messages. Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: NJonathan Corbet <corbet@lwn.net>
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