Minor typos: (adjustments in bold)

 -C  Compile, assemble and link a loadable object file. This option pro-
          duces a Mach-O MacRuby loadable object bundle (.rbo) for every Ruby
          source file passed to rubyc using a default file

  rubyc is also able to generate a dynamic library (.dylib) out of Ruby
     source files, using the --dylib option. Such a library can later be
     linked against an executable that uses the MacRuby runtime. Like executa-
     bles, the Ruby machine code files will run upon #require calls.

Otherwise this seems very clear and helpful.

- Dylan