update doc

docs/lib3x-fibonacci_lattice.md

@@ -30,6 +30,9 @@ Creates visually even spacing of n points on the surface of the sphere. Nearest-
 
 ![fibonacci_lattice](images/lib3x-fibonacci_lattice-1.JPG)
     
+    use <fibonacci_lattice.scad>
+    use <polyline_join.scad>
+
     n = 200;
     radius = 20;
     pts = fibonacci_lattice(n, radius);