Add FirmwareResiliencyError to redfish-resource-supplement-for-pfr doc

Add FirmwareResiliencyError message registry entry to the
redfish-resource-supplement-for-pfr document.

FirmwareResiliencyError message entry is implemented and used in the
following patches.
https://gerrit.openbmc-project.xyz/c/openbmc/bmcweb/+/43280
https://gerrit.openbmc-project.xyz/c/openbmc/pfr-manager/+/43281

Signed-off-by: Chalapathi Venkataramashetty <chalapathix.venkataramashetty@intel.com>
Change-Id: I5dfa0c3bd991e256ddd21c68be79ad7c0af3ff52
diff --git a/designs/redfish-resource-supplement-for-pfr.md b/designs/redfish-resource-supplement-for-pfr.md
index a46fc57..be4515f 100644
--- a/designs/redfish-resource-supplement-for-pfr.md
+++ b/designs/redfish-resource-supplement-for-pfr.md
@@ -111,6 +111,7 @@
        - BMCFirmwareResiliencyError
        - CPLDFirmwareResiliencyError
        - MEFirmwareResiliencyError
+       - FirmwareResiliencyError
      Severity: Critical
 
      Below are some cases, where firmware resiliency error events logged