Wrong `video.addToAlbum` response type

[elias506]

On https://dev.vk.com/method/video.addToAlbum has only base_ok_response

But in schema there are two responses:

 "responses": {
        "response": {
          "$ref": "responses.json#/definitions/base_ok_response"
        },
        "multiResponse": {
          "$ref": "responses.json#/definitions/video_changeVideoAlbums_response"
        }
      },

[elias506]

Save problem with https://vk.com/dev/video.removeFromAlbum