docs about how to correctly assign dict keys to data columns

[benzkji]

This package is powerfull, formatting and the like support, nice. But I'm struggling with basic stuff: when adding only the titles key to my column_header config attribute of my view, I have to add dict keys of my rows in the correct order. That's the only way I found, how to assign these keys to the correct column in the xlsx...hopefully, I'm missing something obvious?!