bpo-27351: Fix ConfigParser.read() documentation and docstring (GH-8123)

Switch "list" with "iterable" to match with the implementation.
(cherry picked from commit e45473e3ca31e5b78dc85cab575f5bb60d5b7f8f)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
2 files changed