Fixed Maps.java comment to reflect current code

Change-Id: I679123eada764a2b1d142f335d964ec653d99c07
diff --git a/guava/src/com/google/common/collect/Maps.java b/guava/src/com/google/common/collect/Maps.java
index 703c447..4215869 100644
--- a/guava/src/com/google/common/collect/Maps.java
+++ b/guava/src/com/google/common/collect/Maps.java
@@ -227,7 +227,7 @@
    */
   public static <K, V> TreeMap<K, V> newTreeMap(
       @Nullable Comparator<? super K> comparator) {
-    // Ideally, the extra type parameter "C" shouldn't be necessary. It is a
+    // Ideally, the "? super" shouldn't be necessary. It is a
     // work-around of a compiler type inference quirk that prevents the
     // following code from being compiled:
     // Comparator<Class<?>> comparator = null;