minor doc fix

src/form.jl

@@ -815,7 +815,7 @@ Bezigon{P<:BezierPolygonPrimitive} = Form{P}
  Define a bezier polygon. `anchor0` is the starting point as an `(x,y)` tuple.
  `sides` contains Vectors of side points (tuples): each vector has the control point(s) and end point for each side 
  (the end point forms the next starting point).
- For SVG, the sides can be quadratic (2 points) or cubic (3 points) bezier curves. For Cairo backends, only cubic beziers are supported.
+ The sides can be linear (1 point), quadratic (2 points) or cubic (3 points).
  """
 function bezigon(anchor0::XYTupleOrVec, sides::Vector{T}, tag=empty_tag) where T<:Vector{<:XYTupleOrVec}
     anchor = (x_measure(anchor0[1]), y_measure(anchor0[2]))