[boost] [config] typo on doc

Hi, there are some typos in the table " Macros that describe C++0x features not supported " BOOST_NO_DEFAULTED_FUNCTIONS The compiler does not support defaulted (= default) functions. [[BOOST_NO_DELETED_FUNCTIONS The compiler does not support deleted (= delete) functions. BOOST_NO_UNICODE_LITERALS The compiler does not support Unicode (u8, u, U#) literals. ]] [[BOOST_NO_VARIADIC_TEMPLATES` The compiler does not support variadic templates. Can some macros be added to emulate the compiler behavior when BOOST_NO_DEFAULTED_FUNCTIONS BOOST_CONSTRUCTOR_DEFAULT BOOST_COPYCONSTRUCTOR_DEFAULT BOOST_NO_DELETED_FUNCTIONS BOOST_CONSTRUCTOR_DELETE BOOST_COPYCONSTRUCTOR_DELETE Best, Vicente