known issues: reformat, update signature bug

KNOWN_ISSUES.md

@@ -2,12 +2,16 @@
 
 ## [Provision node fails with fcos image 33.20210301.3.1 and later](https://github.com/openshift/okd/issues/566)
   **Effected Versions:** 4.7.0-0.okd-2021-02-25-144700 and greater
+
   **Description:** Update Fedora CoreOS images are using a new method of extended attributes check, breaking extraction of embedded OS extensions RPMs.
+
   **Workaround:** Use FCOS 33.20210217.3.0 - [ISO](https://builds.coreos.fedoraproject.org/prod/streams/stable/builds/33.20210217.3.0/x86_64/fedora-coreos-33.20210217.3.0-live.x86_64.iso)
 
 ## [Invalid signature error when attempting cluster updates](https://github.com/openshift/okd/issues/605)
-  **Effected Versions:** 4.7.0-0.okd-2021-04-11-124433
+  **Effected Versions:** 4.7.0-0.okd-2021-04-11-124433 and 4.7.0-0.okd-2021-05-22-050008
+
   **Description:** Cluster upgrades will not start due to incorrect image signatures.
+
   **Workaround:** Perform the upgrade in the terminal using the --force and --allow-upgrade-with-warnings flags after first resetting any in-process upgrades.
   ```bash
   oc adm upgrade --reset
@@ -18,8 +22,13 @@
   oc patch clusterversion version --type="merge" -p '{"spec":{"desiredUpdate":{"force":true}}}'
   ```
 
+  New signing key is used in `4.7.0-0.okd-2021-05-22-050008`, so newer releases would pass signature check correctly.
+
 ## [Some optional operators from OCP are not available in OKD](https://github.com/openshift/okd/issues/456)
   **Effected Versions:** All
+
   **Description:** OCP users can install Logging/Serverless/GPU and other operators from Red Hat OperatorHub. This requires redhat.io pull secret, which may not be available for OKD users.
+
   **Workaround:** Start installation with a pull secret from cloud.redhat.com, enable new source in operatorhub settings.
-    OKD-specific catalog with community versions of mentioned operators is in progress.
+
+  OKD-specific catalog with community versions of mentioned operators is in progress.