message: memo: clarified difference between serialization and string value retrieval
diff: @@ -207,6 +207,29 @@ std::cout << j.dump(4) << std::endl;
  // }
  ```
  +Note the difference between serialization and assignment:
  +
  +```cpp
  +// store a string in a JSON value
  +json j_string = "this is a string";
  +
  +// retrieve the string value (implicit JSON to std::string conversion)
  +std::string cpp_string = j_string;
  +// retrieve the string value (explicit JSON to std::string conversion)
  +auto cpp_string2 = j_string.get<std::string>();
  +
  +// retrieve the serialized value (explicit JSON serialization)
  +std::string serialized_string = j_string.dump();
  +
  +// output of original string
  +std::cout << cpp_string << " == " << cpp_string2 << " == " << j_string.get<std::string>() << '\n';
  +// output of serialized value
  +std::cout << j_string << " == " << serialized_string << std::endl;
  +```
  +
  +`.dump()` always returns the serialized value, and `.get<std::string>()` returns the originally stored string value.
  +
  +
  #### To/from streams (e.g. files, string streams)
  You can also use streams to serialize and deserialize:
  