message: fix s3 secret property
diff: "description": "This value specifies the endpoint to access with the S3 Connector. This is an optional property; change it only if you want to try a different service endpoint or want to switch between https and http. Type: string (or Expression with resultType string)."
  },
  "sessionToken": {
  - "type": "object",
  - "description": "The session token for the S3 temporary security credential. Type: string (or Expression with resultType string)."
  + "$ref": "../datafactory.json#/definitions/SecretBase",
  + "description": "The session token for the S3 temporary security credential."
  },
  "encryptedCredential": {
  "type": "object",
  