Helm: update readme with 2.2 release notes link (#2497)

* Helm: update readme with 2.2 release notes link

Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>
Co-authored-by: Ursula Kallio <ursula.kallio@grafana.com>

operations/helm/charts/mimir-distributed/README.md

@@ -2,6 +2,8 @@
 
 Helm chart for deploying [Grafana Mimir](https://grafana.com/docs/mimir/v2.2.x/) or optionally [Grafana Enterprise Metrics](https://grafana.com/docs/enterprise-metrics/v2.2.x/) to Kubernetes. Derived from [Grafana Enterprise Metrics Helm Chart](https://github.com/grafana/helm-charts/blob/main/charts/enterprise-metrics/README.md)
 
+See the [Grafana Mimir version 2.2 release notes](https://grafana.com/docs/mimir/v2.2.x/release-notes/v2.2/) and [Upgrade the Grafana Mimir Helm chart from version 2.1 to 3.0](https://grafana.com/docs/mimir/latest/operators-guide/deploy-grafana-mimir/upgrade-helm-chart-2.1-to-3.0/).
+
 # mimir-distributed
 
 ![Version: 3.0.0-rc.3](https://img.shields.io/badge/Version-3.0.0--rc.3-informational?style=flat-square) ![AppVersion: 2.2.0](https://img.shields.io/badge/AppVersion-2.2.0-informational?style=flat-square)
@@ -86,9 +88,10 @@ To install the chart with licensed features enabled, using a local Grafana Enter
 helm install <cluster name> grafana/mimir-distributed --set 'enterprise.enabled=true' --set-file 'license.contents=./license.jwt'
 ```
 
-### Upgrade from a previous version of Grafana Enterprise Metrics
+### Upgrade from version 1.7 of Grafana Enterprise Metrics
 
-Please consult the [migration guide](https://grafana.com/docs/enterprise-metrics/v2.2.x/migrating-from-gem-1.7/) for details on how to prepare the configuration. Prepare a custom values file, with the contents:
+To make the necessary configuration changes, see [Migrating from Grafana Enterprise Metrics 1.7](https://grafana.com/docs/enterprise-metrics/latest/migrating-from-gem-1.7/).
+Prepare a custom values file, with the contents:
 
 ```yaml
 enterprise:

operations/helm/charts/mimir-distributed/README.md.gotmpl

@@ -2,6 +2,8 @@
 
 Helm chart for deploying [Grafana Mimir]({{ template "chart.homepage" . }}) or optionally [Grafana Enterprise Metrics](https://grafana.com/docs/enterprise-metrics/v2.2.x/) to Kubernetes. Derived from [Grafana Enterprise Metrics Helm Chart](https://github.com/grafana/helm-charts/blob/main/charts/enterprise-metrics/README.md)
 
+See the [Grafana Mimir version 2.2 release notes](https://grafana.com/docs/mimir/v2.2.x/release-notes/v2.2/) and [Upgrade the Grafana Mimir Helm chart from version 2.1 to 3.0](https://grafana.com/docs/mimir/latest/operators-guide/deploy-grafana-mimir/upgrade-helm-chart-2.1-to-3.0/).
+
 {{ template "chart.header" . }}
 
 {{ template "chart.versionBadge" . }}{{ template "chart.typeBadge" . }}{{ template "chart.appVersionBadge" . }}
@@ -82,9 +84,10 @@ To install the chart with licensed features enabled, using a local Grafana Enter
 helm install <cluster name> grafana/mimir-distributed --set 'enterprise.enabled=true' --set-file 'license.contents=./license.jwt'
 ```
 
-### Upgrade from a previous version of Grafana Enterprise Metrics
+### Upgrade from version 1.7 of Grafana Enterprise Metrics
 
-Please consult the [migration guide](https://grafana.com/docs/enterprise-metrics/v2.2.x/migrating-from-gem-1.7/) for details on how to prepare the configuration. Prepare a custom values file, with the contents:
+To make the necessary configuration changes, see [Migrating from Grafana Enterprise Metrics 1.7](https://grafana.com/docs/enterprise-metrics/latest/migrating-from-gem-1.7/).
+Prepare a custom values file, with the contents:
 
 ```yaml
 enterprise: