docs: update helm install docs (envoyproxy#3370)

* docs: update helm install docs

Signed-off-by: yuluo-yx <yuluo08290126@gmail.com>

* docs: move helm chart readme docs position

Signed-off-by: yuluo-yx <yuluo08290126@gmail.com>

---------

Signed-off-by: yuluo-yx <yuluo08290126@gmail.com>

site/content/en/latest/install/install-helm.md

@@ -61,7 +61,11 @@ consideration when debugging.
 
 ## Helm chart customizations
 
-Some of the quick ways of using the helm install command for envoy gateway installation are below. 
+Some of the quick ways of using the helm install command for envoy gateway installation are below.
+
+{{% alert title="Helm Chart Values" color="primary" %}}
+If you want to know all the available fields inside the values.yaml file, please see the [Helm Chart Values](../api).
+{{% /alert %}}
 
 ### Increase the replicas
 
@@ -114,10 +118,6 @@ You can use the below command to install the envoy gateway using values.yaml fil
 helm install eg oci://docker.io/envoyproxy/gateway-helm --version v0.0.0-latest -n envoy-gateway-system --create-namespace -f values.yaml
 ```
 
-{{% alert title="Helm Chart Values" color="primary" %}}
-If you want to know all the available fields inside the values.yaml file, please see the [Helm Chart Values](../api).
-{{% /alert %}}
-
 ## Open Ports
 
 These are the ports used by Envoy Gateway and the managed Envoy Proxy.