update documentation of fill distance for polygons

[pedro-andrade-inpe]

The strategy distance for polygons is not clear in the documentation. It says that " The distance is computed from the centroid of the cell to the closest point, line, or border of a polygon." What happens when the centroid is within the polygon?

[avancinirodrigo]

The distance operation considering both centroids.

See it in attached image.

import("gis")

local proj = Project{
	file = "project.qgs",
	clean = true
}
local f1 = filePath("amazonia-limit.shp", "gis")
local f2 = filePath("amazonia-ports.shp", "gis")
f1:copy(currentDir())
f2:copy(currentDir())
local l1 = Layer{
	project = proj,
	name = "limit",
	file = "amazonia-limit.shp"
}
print(l1)
local l2 = Layer{
	project = proj,
	name = "ports",
	file = "amazonia-ports.shp"
}
print(l2)
l1:fill{
	attribute = "dist",
	operation = "distance",
	layer = l2.name
}

[pedro-andrade-inpe]

So it is not to the border of a polygon. Just update this sentence, please.

[avancinirodrigo]

@pedro-andrade-inpe
Actually, it has been changed in #1566.