[docs] [issue8996] Add a default role to allow writing bare `len` instead of :func:`len`

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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resolution:  -> rejected
stage:  -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8996>
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