updated doc for repeatingTimeIntervals

Author: hiaga

specification/dataprotection/resource-manager/Microsoft.DataProtection/stable/2025-07-01/dataprotection.json

@@ -5391,7 +5391,7 @@
       "description": "Schedule for backup",
       "properties": {
         "repeatingTimeIntervals": {
-          "description": "ISO 8601 repeating time interval format",
+          "description": "ISO 8601 repeating time interval format [R/startDateTime/Duration]. Sample Example: R/2007-03-01T13:00:00Z/P1W",
           "items": {
             "type": "string"
           },