Merge pull request #35380 from opayne1/BZ1860503

adds instructions and guidance for user to change channels

Author: EricPonvelle

modules/understanding-upgrade-channels.adoc

@@ -134,5 +134,21 @@ ifndef::openshift-origin[]
 [discrete]
 == Switching between channels
 
-Your cluster is still supported if you change from the `stable-{product-version}` channel to the `fast-{product-version}` channel. Although you can switch to the `candidate-{product-version}` channel at any time, some releases in that channel might be unsupported release candidates. You can switch from the `candidate-{product-version}` channel to the `fast-{product-version}` channel if your current release is a general availability release. You can always switch from the `fast-{product-version}` channel to the `stable-{product-version}` channel, although if the current release was recently promoted to `fast-{product-version}` there can be a delay of up to a day for the release to be promoted to `stable-{product-version}`. If you change to a channel that does not include your current release, an alert displays and no updates can be recommended, but you can safely change back to your original channel at any point.
+A channel can be switched from the web console or through the `adm upgrade channel` command:
+
+----
+$ oc adm upgrade channel clusterversion version --type json -p '[{"op": "add", "path": "/spec/channel", "value": "<channel>”}]'
+----
+
+The web console will display an alert if you switch to a channel that does not include the current release. The web console does not recommend any updates while on a channel without the current release. You can return to the original channel at any point, however. 
+
+Changing your channel might impact the supportability of your cluster. The following conditions might apply:
+
+* Your cluster is still supported if you change from the `stable-{product-version}` channel to the `fast-{product-version}` channel.
+
+* You can switch to the `candidate-{product-version}` channel at any time, but some releases for this channel might be unsupported.
+
+* You can switch from the `candidate-{product-version}` channel to the `fast-{product-version}` channel if your current release is a general availability release.
+
+* You can always switch from the `fast-{product-version}` channel to the `stable-{product-version}` channel. There is a possible delay of up to a day for the release to be promoted to `stable-{product-version}` if the current release was recently promoted.
 endif::openshift-origin[]