docs: Correct some evaluation results and a httpie option in Tutorial1

[wkwkhautbois]

Description

Fixed some evaluation results in django shell.

• value from JSONRenderer().render(serializer.data) does not contain whitespace
• retrurned type of serializer.validated_data is not OrderedDict but standard dict
• in this tutorial, three snippets are obtained with http http://127.0.0.1:8000/snippets/

Added httpie option

• --unsorted option is required to prevent response json sorted