Tutorial updates: more details on BOOST_SPIRIT_DEFINE, BOOST_SPIRIT_DECLARE and BOOST_SPIRIT_INSTANTIATE

example/x3/calc/calc8/main.cpp

@@ -57,7 +57,6 @@ main()
     iterator_type iter(source.begin());
     iterator_type end(source.end());
 
-
     client::vmachine vm;                                    // Our virtual machine
     client::code_gen::program program;                      // Our VM program
     client::ast::statement_list ast;                        // Our AST