Add banner to OpenShift re: 4.18.22 and 4.18.23 warning (#253)

* Add banner to OpenShift re: 4.18.22 and 4.18.23 warning

Signed-off-by: Andrew Chen <[email protected]>

* change known issue link to redhat

Signed-off-by: Andrew Chen <[email protected]>

* remove link

Signed-off-by: Andrew Chen <[email protected]>

* update wording

Signed-off-by: Andrew Chen <[email protected]>

---------

Signed-off-by: Andrew Chen <[email protected]>

Author: chenopis

openshift/steps-overview.rst

@@ -9,6 +9,11 @@
 Installation and Upgrade Overview on OpenShift
 ##############################################
 
+.. warning::
+
+   Do not use or upgrade to OpenShift `4.18.22` or `4.18.23`.
+   There was a breaking change to `crun` in those versions that causes a known issue with all versions of the GPU Operator.
+   Update your OCP cluster to version `4.18.24` or later, which includes a fix for the issue.
 
 ****************
 High-Level Steps