Fix comment for GlobalHandles::MarkIndependent

src/global-handles.h

Index: src/global-handles.h
diff --git a/src/global-handles.h b/src/global-handles.h
index e1722d8e9914b41a30f701e077f0c0b27dcb398b..ac8487b19fb6ee7b2127b9333e279f70e34e38f3 100644
--- a/src/global-handles.h
+++ b/src/global-handles.h
@@ -165,7 +165,7 @@ class GlobalHandles {
   // Clear the weakness of a global handle.
   static void* ClearWeakness(Object** location);
 
-  // Clear the weakness of a global handle.
+  // Mark the reference to this object independent of any object group.
   static void MarkIndependent(Object** location);
 
   // Mark the reference to this object externaly unreachable.