Minor documentation errors fixed

[[Imported from SVN: r4896]]

common/tuples.hh

@@ -79,7 +79,7 @@ namespace Dune
     typedef T1 Type1;
 
     /**
-     * @brief The type of the first field.
+     * @brief The type of the second field.
      */
     typedef TT Type2;
     //     enum{
@@ -141,13 +141,13 @@ namespace Dune
 
     /**
      * @brief Get the second value
-     * @return The first value
+     * @return The second value
      */
     typename TupleAccessTraits<Type2>::NonConstType
     second();
 
     /**
-     * @brief Get the first value
+     * @brief Get the second value
      * @return The second value
      */
     typename TupleAccessTraits<Type2>::ConstType