[issue45516] Add protocol description to the Traversable and TraversableResources documentation

[Filipe Laíns]

Change by Filipe Laíns <lains at riseup.net>:


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pull_requests: +27464
pull_request: https://github.com/python/cpython/pull/29194

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45516>
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