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Doc: update PendingDeprecationWarning explanation (GH-12837)

Keep the nudge towards DeprecationWarning, but remove the
"Note" markup and generally shorten the description.

Ref: https://github.com/python/cpython/pull/12505/files#r273978757
I
Inada Naoki committed
a3283efd30ad52b56d1046138523cbabc6c69daf
Parent: a9a2880
Committed by Nick Coghlan <ncoghlan@gmail.com> on 4/15/2019, 12:40:23 PM