bpo-33649: Change "set_after" reference to say_after.

[dhermes]

I assume this falls under "Trivial changes, like fixing a typo, do not need an issue." If not, I apologize.

https://bugs.python.org/issue33649

[the-knights-who-say-ni]

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[miss-islington]

Thanks @dhermes for the PR, and @1st1 for merging it 🌮🎉.. I'm working now to backport this PR to: 3.7.
🐍🍒⛏🤖

[1st1]

Thanks!

[bedevere-bot]

GH-9386 is a backport of this pull request to the 3.7 branch.