[Doc] Clarify Helm chart location in deployment guide (#38328)

Signed-off-by: Yuichiro Utsumi <utsumi.yuichiro@fujitsu.com>
Signed-off-by: Yuichiro Utsumi <81412151+utsumi-fj@users.noreply.github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

docs/deployment/frameworks/helm.md

@@ -17,6 +17,8 @@ Before you begin, ensure that you have the following:
 
 ## Installing the chart
 
+This guide uses the Helm chart at [examples/online_serving/chart-helm](../../../examples/online_serving/chart-helm).
+
 To install the chart with the release name `test-vllm`:
 
 ```bash