updated kgateway section in bbr quickstart guide (kubernetes-sigs#2179)

Signed-off-by: Nir Rozenbaum <nirro@il.ibm.com>

Author: nirrozenbaum

site-src/guides/serving-multiple-inference-pools-latest.md

@@ -132,6 +132,20 @@ Set the Helm chart version (unless already set).
       oci://us-central1-docker.pkg.dev/k8s-staging-images/gateway-api-inference-extension/charts/inferencepool
       ```
 
+  === "Kgateway"
+
+      ```bash
+      export GATEWAY_PROVIDER=none
+      helm install vllm-deepseek-r1 \
+      --dependency-update \
+      --set inferencePool.modelServers.matchLabels.app=vllm-deepseek-r1 \
+      --set provider.name=$GATEWAY_PROVIDER \
+      --set experimentalHttpRoute.enabled=true \
+      --set experimentalHttpRoute.baseModel=deepseek/vllm-deepseek-r1 \
+      --version $IGW_CHART_VERSION \
+      oci://us-central1-docker.pkg.dev/k8s-staging-images/gateway-api-inference-extension/charts/inferencepool
+      ```
+
 === "Other"
 
       ```bash
@@ -190,6 +204,19 @@ Run `helm upgrade` in order to update in place the HttpRoute mapping of the firs
       --version $IGW_CHART_VERSION
       ```
 
+=== "Kgateway"
+
+      ```bash
+      export GATEWAY_PROVIDER=none
+      helm upgrade vllm-llama3-8b-instruct oci://us-central1-docker.pkg.dev/k8s-staging-images/gateway-api-inference-extension/charts/inferencepool \
+      --dependency-update \
+      --set inferencePool.modelServers.matchLabels.app=vllm-llama3-8b-instruct \
+      --set provider.name=$GATEWAY_PROVIDER \
+      --set experimentalHttpRoute.enabled=true \
+      --set experimentalHttpRoute.baseModel=meta-llama/Llama-3.1-8B-Instruct \
+      --version $IGW_CHART_VERSION
+      ```
+
 === "Other"
 
       ```bash