tweak

From-SVN: r22428

libstdc++/stl/README

@@ -6,7 +6,7 @@ Things are likely to change.  For example, the header file names
 are very likely to change.  The Allocator interface will change.  Etc, etc.
 CYGNUS MAKES NO COMMITTMENT (yet) TO SUPPORT BACKWARD COMPATIBILITY FOR STL.
 
-For examples if things that should work, look in the ../tests directory.
+For examples of things that should work, look in the ../tests directory.
 
 DOCUMENTATION:
 See http://www.sgi.com/Technology/STL/ or http://www.dinkumware.com/