Fix docstring typo in subprocess.py

[xmatthias]

Fix docstring typo in subprocess.py

it should be will, not wil, otherwise this sentence does not make sense.

[the-knights-who-say-ni]

Hello, and thanks for your contribution!

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[tirkarthi]

LGTM. Thanks for catching this.

[xmatthias]

give me a bit - i'm moving through CLA

edit: signed it twice now (once before registering and once after - and my github username is attached to the profile).
I hope it'll just need some time to show up on the heroku app.

[miss-islington]

Thanks @xmatthias for the PR, and @gpshead for merging it 🌮🎉.. I'm working now to backport this PR to: 3.7, 3.8.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[bedevere-bot]

GH-15854 is a backport of this pull request to the 3.8 branch.

[bedevere-bot]

GH-15855 is a backport of this pull request to the 3.7 branch.