docs: trivial typo fix (#3449)

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Henry Gomersall 2021-01-20 15:28:35 +00:00 committed by GitHub
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@ -142,7 +142,7 @@ pub struct MutexGuard<'a, T: ?Sized> {
/// unlike `MutexGuard`, it will have the `'static` lifetime.
///
/// As long as you have this guard, you have exclusive access to the underlying
/// `T`. The guard internally keeps a reference-couned pointer to the original
/// `T`. The guard internally keeps a reference-counted pointer to the original
/// `Mutex`, so even if the lock goes away, the guard remains valid.
///
/// The lock is automatically released whenever the guard is dropped, at which