added doxygen documentation for standard (non-vector) binary search functions
added doxygen documentation for standard (non-vector) binary search functions

--HG--
extra : convert_revision : svn%3A83215879-3e5a-4751-8c9d-778f44bb06a5/trunk%40153

xiongzhanblake/thrust_src,thrust/thrust,jaredhoberock/thrust,zhenglaizhang/thrust,sarvex/thrust,GrimDerp/thrust,mohamed-ali/thrust,xiongzhanblake/thrust_src,thrust/thrust,GrimDerp/thrust,andrewcorrigan/thrust-multi-permutation-iterator,zeryx/thrust,dachziegel/thrust,andrewcorrigan/thrust-multi-permutation-iterator,zeryx/thrust,sdalton1/thrust,sarvex/thrust,jaredhoberock/thrust,thvasilo/thrust,raygit/thrust,marksantos/thrust,xiongzhanblake/thrust,jaredhoberock/thrust,andrewcorrigan/thrust-multi-permutation-iterator,sdalton1/thrust,egaburov/thrust,marksantos/thrust,thrust/thrust,marksantos/thrust,egaburov/thrust,arnabgho/thrust,arnabgho/thrust,xiongzhanblake/thrust,Ricardo666666/thrust,thrust/thrust,Ricardo666666/thrust,jaredhoberock/thrust,mohamed-ali/thrust,xiongzhanblake/thrust,arnabgho/thrust,thvasilo/thrust,mohamed-ali/thrust,GrimDerp/thrust,raygit/thrust,dachziegel/thrust,egaburov/thrust,raygit/thrust,jaredhoberock/thrust,sarvex/thrust,zhenglaizhang/thrust,dachziegel/thrust,thrust/thrust,sdalton1/thrust,thvasilo/thrust,xiongzhanblake/thrust_src,Ricardo666666/thrust,zeryx/thrust,zhenglaizhang/thrust