Merge pull request #50530 from wking/drop-nightly-mentions

modules/understanding-upgrade-channels: Drop nightly discussions

Author: jab-rh

modules/understanding-upgrade-channels.adoc

@@ -18,18 +18,6 @@ The `candidate-{product-version}` channel contains candidate builds for a z-stre
 
 You can use the `candidate-{product-version}` channel to update from a previous minor version of {product-title}.
 
-[NOTE]
-====
-Release candidates differ from the nightly builds. Nightly builds are available for early access to features, but updating to or from nightly builds is neither recommended nor supported. Nightly builds are not available in any upgrade channel. You can reference the {product-title}
-ifdef::openshift-origin[]
-link:https://origin-release.apps.ci.l2s4.p1.openshiftapps.com/[release statuses]
-endif::[]
-ifndef::openshift-origin[]
-link:https://openshift-release.apps.ci.l2s4.p1.openshiftapps.com/[release statuses]
-endif::[]
-for more build information.
-====
-
 [id="fast-version-channel_{context}"]
 == fast-{product-version} channel