Fix sphinx/build_docs warnings for graphics

Author: MaximSmolskiy

graphics/bezier_curve.py

@@ -27,6 +27,7 @@ def basis_function(self, t: float) -> list[float]:
         The basis function determines the weight of each control point at time t.
             t: time value between 0 and 1 inclusive at which to evaluate the basis of
                the curve.
+
         returns the x, y values of basis function at time t
 
         >>> curve = BezierCurve([(1,1), (1,2)])