fix(post): added helm update and install

Author: timothystewart6

_posts/2021-11-20-grafana-loki-kubernetes.md

@@ -20,7 +20,7 @@ First add Loki's chart repository to `helm`
 helm repo add grafana https://grafana.github.io/helm-charts
 ```
 
-The update the chart repository
+Then update the chart repository
 
 ```bash
 helm repo add grafana https://grafana.github.io/helm-charts