Update gaming/egg2/tutorial.md
Update gaming/egg2/tutorial.md

Co-authored-by: Koichi Watanabe <bcf9bbc73b587504ba3a3c9a3b3e551bb65d1d42@google.com>
GoogleCloudPlatform/gcp-getting-started-lab-jp,GoogleCloudPlatform/gcp-getting-started-lab-jp,GoogleCloudPlatform/gcp-getting-started-lab-jp,GoogleCloudPlatform/gcp-getting-started-lab-jp