bpo-38100: Fixing spelling error in unittest.mock

[maritza05]

https://bugs.python.org/issue38100

[the-knights-who-say-ni]

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[tirkarthi]

Please also #16164 and #16168 . I guess #16164 was the first PR as per timestamp.

[matrixise]

Thank you for your contribution, but I need to close this PR because the author of the PR #16168 was the first one to sign the CLA.