Update entity page example blocks

[jbaross]

Jobs to be done (optional)

Ensure all entity docs under https://release-ai-gateway-2-0--kongdeveloper.netlify.app/ai-gateway/entities/ have working configs in line with 0.7.0 API

Definition of done

Independent reviewer can copy paste config and get expected outputs

Information

See https://kongstrong.slack.com/archives/G012HLJ4GJJ/p1786016758302579

Size

• S (Small). Example: fixing a broken link, updating wording in an FAQ or paragraph