docs: drop stray "the" in Scope::spawn doc comment

[MukundaKatta]

Summary

library/std/src/thread/scoped.rs:180 reads:

borrow non-`'static` data from the outside the scope. See [`scope`] for details.

Dropping the stray "the" so it reads "from outside the scope", matching natural English and the phrasing already used elsewhere in this module.

Fixes #155275

Test plan

• One-word docs-only change, no behavior impact

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[reddevilmidzy]

duplicate of #155325

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