Fix typo.

Author: ColinH

include/tao/pegtl/demangle.hpp

@@ -90,7 +90,7 @@ namespace TAO_PEGTL_NAMESPACE
       static_assert( internal::dependent_true< T > && ( begin != std::string_view::npos ) );
       constexpr auto tmp = sv.substr( begin + 2 );
       constexpr auto end = tmp.rfind( ';' );
-      static_assert( internal::dependen_true< T > && ( end != std::string_view::npos ) );
+      static_assert( internal::dependent_true< T > && ( end != std::string_view::npos ) );
       return tmp.substr( 0, end );
    }
 
@@ -117,7 +117,7 @@ namespace TAO_PEGTL_NAMESPACE
    {
       constexpr std::string_view sv = __FUNCSIG__;
       constexpr auto begin = sv.find( "demangle<" );
-      static_assert( internal::dependen_true< T > && ( begin != std::string_view::npos ) );
+      static_assert( internal::dependent_true< T > && ( begin != std::string_view::npos ) );
       constexpr auto tmp = sv.substr( begin + 9 );
       constexpr auto end = tmp.rfind( '>' );
       static_assert( internal::dependent_true< T > && ( end != std::string_view::npos ) );