Fix typo in socketserver docstring

[chrahunt]

Fix typo in the docstring of service_actions.
serve_forver -> serve_forever

[the-knights-who-say-ni]

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[Mariatta]

Thanks for the PR. Please sign the CLA, and then the PR will be automatically be merged.

[miss-islington]

Thanks @chrahunt for the PR 🌮🎉.. I'm working now to backport this PR to: 3.7.
🐍🍒⛏🤖

[bedevere-bot]

GH-11281 is a backport of this pull request to the 3.7 branch.