[Doc] Minor fix in disaggregated prefill documentation

[YuhanLiu11]

FILL IN THE PR DESCRIPTION HERE

FIX #xxxx (link existing issues this PR will resolve)

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[gemini-code-assist]

Summary of Changes

Hello @YuhanLiu11, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request provides minor fixes to the disaggregated prefill documentation. The changes ensure that the command examples for deploying with Helm and port-forwarding the router service use the correct and consistent naming conventions, improving the accuracy and usability of the tutorial.

Highlights

• Documentation Update: Corrected the helm install command in the disaggregated prefill tutorial to use vllm as the release name instead of pd.
• Documentation Update: Updated the kubectl port-forward command in the disaggregated prefill tutorial to reference vllm-router-service instead of pd-router-service.

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[gemini-code-assist]

Code Review

This pull request updates the Helm release name in the disaggregated prefill tutorial from pd to vllm, and consistently updates the corresponding service name. The changes are functionally correct. My feedback focuses on improving the robustness of the tutorial for users by suggesting a more specific Helm release name to prevent potential conflicts in a shared Kubernetes environment.

[gemini-code-assist]

Using a generic release name like vllm could lead to conflicts if users are running multiple vLLM deployments or following other tutorials in the same Kubernetes cluster. A more specific name would be safer and more descriptive.

Consider using a name that reflects this specific tutorial, for example vllm-disagg-prefill.

    helm install vllm-disagg-prefill helm/ -f tutorials/assets/values-16-disagg-prefill.yaml

[gemini-code-assist]

To maintain consistency with the suggested change to the Helm release name, the service name in this port-forward command should also be updated.

    kubectl port-forward svc/vllm-disagg-prefill-router-service 30080:80