[3.8] bpo-39426: Fix outdated default and highest protocols in docs (GH-18154) #18162
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Some portions of the pickle documentation hadn't been updated for the pickle protocol changes in Python 3.8 (new protocol 5, default protocol 4). This PR fixes those docs.
https://bugs.python.org/issue39426
(cherry picked from commit e9652e8)
Co-authored-by: Mark Dickinson mdickinson@enthought.com
https://bugs.python.org/issue39426
Automerge-Triggered-By: @pitrou