[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
[ReCreate this PR](https://github.com/azure-resource-manager-schemas/compare/main...azure-sdk:sdkAuto/redis?expand=1)

Author: msftbot[bot]

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",