update link to grafana helm chart content (#16933)

Author: nwatson-plaid

content/en/docs/ops/integrations/grafana/index.md

@@ -81,4 +81,4 @@ Grafana can be installed and configured through other methods. To import Istio d
 refer to the documentation for the installation method. For example:
 
 * [Grafana provisioning](https://grafana.com/docs/grafana/latest/administration/provisioning/#dashboards) official documentation.
-* [Importing dashboards](https://github.com/helm/charts/tree/master/stable/grafana#import-dashboards) for the `stable/grafana` Helm chart.
+* [Importing dashboards](https://github.com/grafana/helm-charts/tree/main/charts/grafana#import-dashboards) for the `stable/grafana` Helm chart.

content/es/docs/ops/integrations/grafana/index.md

@@ -81,4 +81,4 @@ Grafana can be installed and configured through other methods. To import Istio d
 refer to the documentation for the installation method. For example:
 
 * [Grafana provisioning](https://grafana.com/docs/grafana/latest/administration/provisioning/#dashboards) official documentation.
-* [Importing dashboards](https://github.com/helm/charts/tree/master/stable/grafana#import-dashboards) for the `stable/grafana` Helm chart.
+* [Importing dashboards](https://github.com/grafana/helm-charts/tree/main/charts/grafana#import-dashboards) for the `stable/grafana` Helm chart.

content/uk/docs/ops/integrations/grafana/index.md

@@ -73,4 +73,4 @@ $ done
 Grafana може бути встановлена та налаштована іншими методами. Для імпорту панелей управління Istio, ознайомтеся з документацією для методу встановлення. Наприклад:
 
 * Офіційна документація [Provisioning Grafana](https://grafana.com/docs/grafana/latest/administration/provisioning/#dashboards).
-* [Імпорт інфопанелей](https://github.com/helm/charts/tree/master/stable/grafana#import-dashboards) для Helm chart `stable/grafana`.
+* [Імпорт інфопанелей](https://github.com/grafana/helm-charts/tree/main/charts/grafana#import-dashboards) для Helm chart `stable/grafana`.

content/zh/docs/ops/integrations/grafana/index.md

@@ -74,5 +74,5 @@ Grafana 可以通过其他方法进行安装和配置。要导入 Istio 仪表
 请参考文档中的安装方法，例如：
 
 * [Grafana 配置](https://grafana.com/docs/grafana/latest/administration/provisioning/#dashboards)官方文档。
-* [导入仪表盘](https://github.com/helm/charts/tree/master/stable/grafana#import-dashboards)
+* [导入仪表盘](https://github.com/grafana/helm-charts/tree/main/charts/grafana#import-dashboards)
   `stable/grafana` Helm Chart 文档。