{AzurePostgreSQL} fixes Azure#22851 Data encryption type enum should be SystemManaged (Azure#22943)

merged with breaking change approved.

Author: navba-MSFT

specification/postgresql/resource-manager/Microsoft.DBforPostgreSQL/stable/2022-12-01/FlexibleServers.json

@@ -772,9 +772,9 @@
         },
         "type": {
           "type": "string",
-          "description": "Data encryption type to depict if it is System assigned vs Azure Key vault.",
+          "description": "Data encryption type to depict if it is System Managed vs Azure Key vault.",
           "enum": [
-            "SystemAssigned",
+            "SystemManaged",
             "AzureKeyVault"
           ],
           "x-ms-enum": {