Correct typos in core::sync::Exclusive::get_{pin_mut, mut}

Author: albertlarsan68

library/core/src/sync/exclusive.rs

@@ -138,7 +138,7 @@ impl<T: ?Sized> Exclusive<T> {
         unsafe { Pin::new_unchecked(&mut self.get_unchecked_mut().inner) }
     }
 
-    /// Build a _mutable_ references to an `Exclusive<T>` from
+    /// Build a _mutable_ reference to an `Exclusive<T>` from
     /// a _mutable_ reference to a `T`. This allows you to skip
     /// building an `Exclusive` with [`Exclusive::new`].
     #[unstable(feature = "exclusive_wrapper", issue = "98407")]
@@ -149,7 +149,7 @@ impl<T: ?Sized> Exclusive<T> {
         unsafe { &mut *(r as *mut T as *mut Exclusive<T>) }
     }
 
-    /// Build a _pinned mutable_ references to an `Exclusive<T>` from
+    /// Build a _pinned mutable_ reference to an `Exclusive<T>` from
     /// a _pinned mutable_ reference to a `T`. This allows you to skip
     /// building an `Exclusive` with [`Exclusive::new`].
     #[unstable(feature = "exclusive_wrapper", issue = "98407")]