PEL: Correct "occured" spelling

"occured" is mispelled.
Change it to "occurred"

Signed-off-by: Michael Lim <youhour@us.ibm.com>
Change-Id: I6dc16a334c71b9681015f8ea7a820ba090f616cd
diff --git a/extensions/openpower-pels/registry/message_registry.json b/extensions/openpower-pels/registry/message_registry.json
index 7d912bb..5b1471a 100644
--- a/extensions/openpower-pels/registry/message_registry.json
+++ b/extensions/openpower-pels/registry/message_registry.json
@@ -445,8 +445,8 @@
 
             "Documentation":
             {
-                "Description": "Failure occured during boot process",
-                "Message": "Failure occured during boot process",
+                "Description": "Failure occurred during boot process",
+                "Message": "Failure occurred during boot process",
                 "Notes": [
                     "Debug traces will be captured in AdditionalData section"
                 ]
@@ -592,8 +592,8 @@
 
             "Documentation":
             {
-                "Description": "Failure occured during hardware isolation operations",
-                "Message": "Failure occured during hardware isolation operations",
+                "Description": "Failure occurred during hardware isolation operations",
+                "Message": "Failure occurred during hardware isolation operations",
                 "Notes": [
                     "Severity needs to be set based on needs for this registry.",
                     "Debug traces will be captured in AdditionalData section"