message: Update TraceMe lambda example
diff: @@ -123,8 +123,11 @@ class TraceMe {
  // name_generator is templated, rather than a std::function to avoid
  // allocations std::function might make even if never called.
  // Example Usage:
  + // TraceMe trace_me([&]() {
  + // return StrCat("my_trace", id);
  + // }
  // TraceMe op_trace_me([&]() {
  - // return StrCat(op_name, ":", op_type);
  + // return TraceMeOp(op_name, op_type);
  // }
  // TraceMe trace_me_with_metadata([&value1]() {
  // return TraceMeEncode("my_trace", {{"key1", value1}, {"key2", 42}});
  