doxygen markup in tr1/tuple

[chris]

I've been trying to syncronise my tuple patch with the doxygen markup 
which has been added. The only thing I don't understand are the three 
comments

/// @brief  Template class tuple
/// @brief  class tuple_size
/// @brief  class tuple_element

Which seem to have been added to the last specialisation of each of 
these classes. Any particular reason they are attached to the last 
speciailisation, when there is already some markup attached to the 
forward decleration?

Chris