Small bug on the Uppy docs. #File Object does not contain property file.name

[agreentejada]

Thanks a bunch for making this, it's saved so many dev hours. I'm working with the base JS version of the app, and I noticed that if you go down to https://uppy.io/docs/uppy/#File-Objects, the property file.name isn't mentioned as part of the object, even though it's used a bunch in other parts of the code.