`callbackOrConfig` argument is documented [here](https://github.com/google/google-api-javascript-client/blob/master/docs/reference.md#----gapiloadlibraries-callbackorconfig------) But as you can see in the [source](https://github.com/Maxim-Mazurok/gapi/blob/929959ac9736eab82ee64406f94b4301215422ac/unminified.js#L1454) this object may also have `config` property. And `config` property may also have `update` property. Can anyone add documentation regarding this, please?
