Fix example code in comment for WithDomains(TupleOf(...))

PiperOrigin-RevId: 491917066
diff --git a/fuzztest/internal/registration.h b/fuzztest/internal/registration.h
index 4fd6666..01ff4ef 100644
--- a/fuzztest/internal/registration.h
+++ b/fuzztest/internal/registration.h
@@ -118,7 +118,7 @@
   // }
   //
   // void MyProperty(std::string s, int i) { ... }
-  // FUZZ_TEST(MySuite).WithDomains(StringAndIndex(10));
+  // FUZZ_TEST(MySuite, MyProperty).WithDomains(StringAndIndex(10));
   template <typename... NewDomains>
   auto WithDomains(
       AggregateOfImpl<std::tuple<typename NewDomains::value_type...>,