Fix iterator copied() documentation example code

Author: schteve

src/libcore/iter/traits/iterator.rs

@@ -2717,12 +2717,12 @@ pub trait Iterator {
     /// ```
     /// let a = [1, 2, 3];
     ///
-    /// let v_cloned: Vec<_> = a.iter().copied().collect();
+    /// let v_copied: Vec<_> = a.iter().copied().collect();
     ///
     /// // copied is the same as .map(|&x| x)
     /// let v_map: Vec<_> = a.iter().map(|&x| x).collect();
     ///
-    /// assert_eq!(v_cloned, vec![1, 2, 3]);
+    /// assert_eq!(v_copied, vec![1, 2, 3]);
     /// assert_eq!(v_map, vec![1, 2, 3]);
     /// ```
     #[stable(feature = "iter_copied", since = "1.36.0")]