message: Add documentation for Parse() function of OptionsParser
diff: @@ -117,7 +117,10 @@ public:
  required));
  }
  -
  + /** Parse the command-line options. Note that this function expects all the
  + options provided through the command line to have a corresponding
  + AddOption. In particular, this function cannot be used for partial
  + parsing. */
  void Parse();
  bool Good() const { return (error_type == 0); }
  bool Help() const { return (error_type == 1); }
  