Update cell.rs

Author: notriddle

src/libcore/cell.rs

@@ -591,7 +591,7 @@ impl<T> RefCell<T> {
     /// assert_eq!(cell, RefCell::new(6));
     /// ```
     #[inline]
-    #[stable(feature = "refcell_replace_swap", since="1.24.0")]
+    #[stable(feature = "refcell_replace", since="1.24.0")]
     pub fn replace(&self, t: T) -> T {
         mem::replace(&mut *self.borrow_mut(), t)
     }
@@ -616,7 +616,7 @@ impl<T> RefCell<T> {
     /// assert_eq!(cell, RefCell::new(6));
     /// ```
     #[inline]
-    #[unstable(feature = "refcell_replace_with", issue="43570")]
+    #[unstable(feature = "refcell_replace_swap", issue="43570")]
     pub fn replace_with<F: FnOnce(&mut T) -> T>(&self, f: F) -> T {
         let mut_borrow = &mut *self.borrow_mut();
         let replacement = f(mut_borrow);
@@ -643,7 +643,7 @@ impl<T> RefCell<T> {
     /// assert_eq!(d, RefCell::new(5));
     /// ```
     #[inline]
-    #[stable(feature = "refcell_replace_swap", since="1.24.0")]
+    #[stable(feature = "refcell_swap", since="1.24.0")]
     pub fn swap(&self, other: &Self) {
         mem::swap(&mut *self.borrow_mut(), &mut *other.borrow_mut())
     }