In the website reference for diectionalLight there are a couple of typos -

Para 5:
'direction sets the light’s direction using a p5.Geometry object'
should be
'direction sets the light’s direction using a p5.Vector object'

Para 7:
'direction, sets the light’s direction using a p5.Color object.'
should be
'direction, sets the light’s direction using a p5.Vector object.'