Update PROVIDER_NAME to GATEWAY_PROVIDER

Author: rahulgurnani

site-src/guides/index.md

@@ -265,13 +265,13 @@ A cluster with:
 
 ### Deploy the InferencePool and Endpoint Picker Extension
 
-   Install an InferencePool named vllm-llama3-8b-instruct that selects from endpoints with label app: vllm-llama3-8b-instruct and listening on port 8000, you can run the following command:
+   Install an InferencePool named `vllm-llama3-8b-instruct` that selects from endpoints with label app: vllm-llama3-8b-instruct and listening on port 8000, you can run the following command:
 
    ```bash
-   export PROVIDER_NAME=none #  See [README](https://github.com/kubernetes-sigs/gateway-api-inference-extension/blob/main/config/charts/inferencepool/README.md#configuration) for valid configurations
+   export GATEWAY_PROVIDER=none #  See [README](https://github.com/kubernetes-sigs/gateway-api-inference-extension/blob/main/config/charts/inferencepool/README.md#configuration) for valid configurations
    helm install vllm-llama3-8b-instruct \
    --set inferencePool.modelServers.matchLabels.app=vllm-llama3-8b-instruct \
-   --set provider.name=$PROVIDER_NAME \
+   --set provider.name=$GATEWAY_PROVIDER \
    --version v0.3.0 \
    oci://registry.k8s.io/gateway-api-inference-extension/charts/inferencepool
    ```