Fixed typo

Author: Phlosioneer

src/libstd/collections/hash/map.rs

@@ -2262,7 +2262,7 @@ impl<'a, K, V> OccupiedEntry<'a, K, V> {
     /// assert_eq!(map["poneyland"], 12);
     /// if let Entry::Occupied(mut o) = map.entry("poneyland") {
     ///     *o.get_mut() += 10;
-    ///     assert_eq!(o.get(), 22);
+    ///     assert_eq!(*o.get(), 22);
     ///
     ///     // We can use the same Entry multiple times.
     ///     *o.get_mut() += 2;