Changes and fixes for Boost 1.37

[SVN r49277]

example/doc_named_allocB.cpp

@@ -21,7 +21,7 @@ int main ()
    typedef std::pair<double, int> MyType;
 
    try{
-      //An special shared memory where we can
+      //A special shared memory where we can
       //construct objects associated with a name.
       //Connect to the already created shared memory segment
       //and initialize needed resources