removed std:: prefix from slist

[SVN r12310]

iterator_adaptors.htm

@@ -723,7 +723,7 @@ freely mixed in comparison and subtraction expressions.
 
     <p>There is an unlimited number of ways the <tt>iterator_adaptors</tt>
     class can be used to create iterators. One interesting exercise would be to
-    re-implement the iterators of <tt>std::list</tt> and <tt>std::slist</tt>
+    re-implement the iterators of <tt>std::list</tt> and <tt>slist</tt>
     using <tt>iterator_adaptors</tt>, where the adapted <tt>Iterator</tt> types
     would be node pointers.