gh-87597: Document TimeoutExpired.stdout & .stderr types (GH-97685)

This documents the behavior that has always been the case since timeout
support was introduced in Python 3.3.
(cherry picked from commit b05dd796492160c37c9e15e3882f699f411b3461)

Co-authored-by: Gregory P. Smith <greg@krypto.org>

Miss Islington (bot) committed 3y ago

6d7dbcc0b365c9f227a4c299211c068b3da54a90

Parent: b61a51a

Committed by GitHub <noreply@github.com> on 9/30/2022, 5:53:07 PM