libcollections: btree/map: fix typos

Author: istankovic

src/libcollections/btree/map.rs

@@ -656,7 +656,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     }
 
     /// Constructs a double-ended iterator over a sub-range of elements in the map.
-    /// The simplest way is to use the range synax `min..max`, thus `range(min..max)` will
+    /// The simplest way is to use the range syntax `min..max`, thus `range(min..max)` will
     /// yield elements from min (inclusive) to max (exclusive).
     /// The range may also be entered as `(Bound<T>, Bound<T>)`, so for example
     /// `range((Excluded(4), Included(10)))` will yield a left-exclusive, right-inclusive
@@ -748,7 +748,7 @@ impl<K: Ord, V> BTreeMap<K, V> {
     }
 
     /// Constructs a mutable double-ended iterator over a sub-range of elements in the map.
-    /// The simplest way is to use the range synax `min..max`, thus `range(min..max)` will
+    /// The simplest way is to use the range syntax `min..max`, thus `range(min..max)` will
     /// yield elements from min (inclusive) to max (exclusive).
     /// The range may also be entered as `(Bound<T>, Bound<T>)`, so for example
     /// `range((Excluded(4), Included(10)))` will yield a left-exclusive, right-inclusive