variable naming of font_path leads to false assumptions

[anonymous]

because the varibla was called font_path and the example stated out /path/to/font/ I added the path to the font there, until I go throw the implementation and found out that the font has to be defined instead.

So the variable should be either renamed to font_file or an additional variable should be used to define the font within font_path.

Minor fix but I spend aprox. an hour to find.