Add extra line after code fence.

code/compiler/13/error.cpp

@@ -12,7 +12,7 @@ void type_error::pretty_print(std::ostream& to, parse_driver& drv) {
         to << "occuring on line " << loc->begin.line << ":" << std::endl;
         to << std::endl << "```" << std::endl;
         drv.print_highlighted_location(to, *loc);
-        to << "```" << std::endl;
+        to << "```" << std::endl << std::endl;
     }
 }