FTL: Amend outdated ftl::Function example usage

Bug: 185536303
Flag: DOCS_ONLY
Test: N/A
Change-Id: I96246cacb63dec70caa732064fd5159d596d4e25
diff --git a/include/ftl/function.h b/include/ftl/function.h
index 3538ca4..bda5b75 100644
--- a/include/ftl/function.h
+++ b/include/ftl/function.h
@@ -123,7 +123,7 @@
 //   // 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);
 //       });