Update restore-point-troubleshooting.md

InternalDiskRestorePointError due to Extension status can't be retrieved hence, The Snapshot can't be taken.

Author: tarunkumar01

articles/virtual-machines/restore-point-troubleshooting.md

@@ -245,9 +245,9 @@ If you are creating restore points for a VM that has encrypted disks, you must e
 
 Restore points are supported only with API version 2022-03-01 or later. If you are using REST APIs to create and manage restore points, use the specified API version when calling the restore point API.
 
-### InternalError / InternalExecutionError / InternalOperationError - An internal execution error occurred. Please retry later.
+### InternalError / InternalExecutionError / InternalOperationError / InternalDiskRestorePointError - An internal execution error occurred. Please retry later.
 
-**Error code**: InternalError / InternalExecutionError / InternalOperationError
+**Error code**: InternalError / InternalExecutionError / InternalOperationError / InternalDiskRestorePointError
 
 **Error message**: An internal execution error occurred. Please retry later.