Clearly identify the start of footnotes

[LeMurphant]

See user feedback https://docs.google.com/document/d/1SY2VqnSfd4qCMnv9rRyDiThJsIKIDOiTARbKYLHwKng/edit

It is not currently clear where the footnotes start. I suggest making the footnoted text smaller, having a clear header to specify them, or both