Merge "FTL: Amend outdated ftl::Function example usage" into main

//   // Create a typedef to give a more meaningful name and bound the size.

//   using MyFunction = ftl::Function<int(std::string_view), 2>;

//   int* ptr = nullptr;

//   auto f1 = MyFunction::make_function(

//   auto f1 = MyFunction::make(

//       [cls = &cls, ptr](std::string_view sv) {

//           return cls->on_string(ptr, sv);

//       });