Mention that hotpatching RCs is unsupported (github#18904)

mattpollard · web-flow · commit b60122a05cf9 · 2021-04-22T08:48:33.000+02:00
diff --git a/content/admin/enterprise-management/upgrading-github-enterprise-server.md b/content/admin/enterprise-management/upgrading-github-enterprise-server.md
@@ -89,7 +89,12 @@ There are two types of snapshots:
 
 {% note %}
 
-**Note**: Installing a hotpatch using the {% data variables.enterprise.management_console %} is not available in clustered environments. To install a hotpatch in a clustered environment, see "[Upgrading a cluster](/enterprise/{{ currentVersion }}/admin/clustering/upgrading-a-cluster#upgrading-with-a-hotpatch)."
+**{% if currentVersion ver_gt "enterprise-server@2.22" %}Notes{% else %}Note{% endif %}**:
+
+{% if currentVersion ver_gt "enterprise-server@2.22" %}
+- If {% data variables.product.product_location %} is running a release candidate build, you can't upgrade with a hotpatch.
+
+- {% endif %}Installing a hotpatch using the {% data variables.enterprise.management_console %} is not available in clustered environments. To install a hotpatch in a clustered environment, see "[Upgrading a cluster](/enterprise/{{ currentVersion }}/admin/clustering/upgrading-a-cluster#upgrading-with-a-hotpatch)."
 
 {% endnote %}
 
