[ReleasePR redis] [Redis Cache] New API Version 2022-06-01 with some …

…extra linked server properties added for server role update/failover support (#2584)

Create to sync Azure/azure-rest-api-specs#20869
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schemas/2022-05-01/Microsoft.Cache.json

@@ -457,7 +457,7 @@
         },
         "rdb-backup-frequency": {
           "type": "string",
-          "description": "Specifies the frequency for creating rdb backup"
+          "description": "Specifies the frequency for creating rdb backup in minutes. Valid values: (15, 30, 60, 360, 720, 1440)"
         },
         "rdb-backup-max-snapshot-count": {
           "type": "string",