Docs: Quickstart Fixes

[danehans]

1. The InferencePool name referenced by the quick start guide (https://github.com/kubernetes-sigs/gateway-api-inference-extension/raw/main/config/manifests/inferencepool-resources.yaml) is no longer vllm-llama2-7b:

apiVersion: inference.networking.x-k8s.io/v1alpha2
kind: InferencePool
metadata:
  labels:
  name: vllm-llama3-8b-instruct
spec:
  targetPortNumber: 8000
  selector:
    app: vllm-llama3-8b-instruct
  extensionRef:
    name: vllm-llama3-8b-instruct-epp

2. The food-review-1 model does not exist. Updates the food-review example InferenceModel to use the correct target model name:

$ kubextl exec deploy/vllm-llama3-8b-instruct -- curl 127.0.0.1:8000/v1/models | jq .
...
    {
      "id": "food-review",
      "object": "model",
...

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[ahg-g]

/lgtm

[kfswain]

/lgtm
/approve

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