[issue25381] Doc: Use of old description of raise in Python3

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


----------
keywords: +patch
pull_requests: +25419
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/26838

_______________________________________
Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25381>
_______________________________________