[3.10] bpo-45147: Fix minor typo in 3.10.rst (GH-28253)

[miss-islington]

(cherry picked from commit 7366854)

Co-authored-by: D.Lintin diantolintin3@gmail.com

https://bugs.python.org/issue45147

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[miss-islington]

@dlintin and @ericvsmith: Status check is done, and it's a failure ❌ .

[miss-islington]

@dlintin and @ericvsmith: Status check is done, and it's a failure ❌ .

[miss-islington]

@dlintin and @ericvsmith: Status check is done, and it's a failure ❌ .

[miss-islington]

@dlintin and @ericvsmith: Status check is done, and it's a success ✅ .