[en] Update tools/_index.md remove old helm definition

Author: huangminjie

content/en/docs/reference/tools/_index.md

@@ -30,9 +30,6 @@ resources itself.
 [Helm](https://helm.sh/) is a tool for managing packages of pre-configured
 Kubernetes resources. These packages are known as _Helm charts_.
 
-Helm is a third party managed tool for managing packages of pre-configured
-Kubernetes resources, aka Kubernetes charts.
-
 Use Helm to:
 
 * Find and use popular software packaged as Kubernetes charts