Fix typo in map.rs

Author: taiki-e

src/map.rs

@@ -237,7 +237,7 @@ impl<K, V, S> IndexMap<K, V, S> {
         }
     }
 
-    /// Return an iterator over mutable references to the the values of the map,
+    /// Return an iterator over mutable references to the values of the map,
     /// in their order
     pub fn values_mut(&mut self) -> ValuesMut<'_, K, V> {
         ValuesMut {

src/rayon/map.rs

@@ -275,7 +275,7 @@ where
     K: Send,
     V: Send,
 {
-    /// Return a parallel iterator over mutable references to the the values of the map
+    /// Return a parallel iterator over mutable references to the values of the map
     ///
     /// While parallel iterators can process items in any order, their relative order
     /// in the map is still preserved for operations like `reduce` and `collect`.