[boost] [program_options] Small typo in the manual

Hi, Note, I'm not 100% sure it's a good idea to post here bugs/typos comments here, but as I've read on this page http://www.boost.org/more/bugs.htm it should be fine. In "Syntactic Information" section of manual of the Boost.Program_options library: http://www.boost.org/doc/html/program_options/overview.html#id2715045 there is a small typo that might be misleading for new readers. In paragraph starting with "For the first parameter, we...", 3rd statement starts with: "For the first option,..." but I believe it should read: "For the second option,..." Cheers -- Mateusz Loskot http://mateusz.loskot.net