Docs: Fix link to values.yaml file (#87014)

Fix link to values.yaml file

Linking to the "edit" URL fails if the reader doesn't have write access
to the repo: they'll be prompted to fork the repo or to sign in to
GitHub. Instead link to the "blob" URL which is accessible to all
readers.

docs/sources/setup-grafana/installation/helm/index.md

@@ -196,7 +196,7 @@ By modifying the values in the `values.yaml` file, you can tailor the deployment
 
 In order to make any configuration changes, download the `values.yaml` file from the Grafana Helm Charts repository:
 
-https://github.com/grafana/helm-charts/edit/main/charts/grafana/values.yaml
+https://github.com/grafana/helm-charts/blob/main/charts/grafana/values.yaml
 
 {{% admonition type="note" %}}
 Depending on your use case requirements, you can use a single YAML file that contains your configuration changes or you can create multiple YAML files.