[boost] [FOREACH, Range] Slight documentation typos.

Hi. Just some documentation typo reports: Typo: 'rannge_iterator' in one example comment on http://boost-sandbox.sourceforge.net/libs/foreach/doc/html/boost_foreach/ext.... 'must rely of range_result_iterator' should read 'must rely on range_result_iterator' on http://boost.org/libs/range/doc/portability.html. Hope this helps. Jurko Gospodnetiæ