Copied the documentation entry and example from Boost.Array. Referred
to std::array as "C++11 array container".
Link to new page from
* reference
* quickref
* point concept
Reverted qbk_begin / qbk_end back to qbk because multi-line IS possible there
Renamed linear_ring to ring
Updated the doxygen_xml2qbk tool
[SVN r68384]
