updated docs

docs/lib-rotate_p.md

@@ -11,6 +11,8 @@ Rotates a point `a` degrees around an arbitrary axis. The rotation is applied in
     
 You can use the code below to create a line.
 
+    include <rotate_p.scad>;
+
 	hull() {
 	    sphere(1);
 	    rotate([0, -45, 45]) 
@@ -20,6 +22,8 @@ You can use the code below to create a line.
 
 The following code has the same effect.
 
+    include <rotate_p.scad>;
+
 	point = [20, 0, 0];
 	a = [0, -45, 45];
 	
@@ -34,6 +38,8 @@ The following code has the same effect.
 
 The `rotate_p` function is useful in some situations. For examples, you probably want to get all points on the path of a spiral around a sphere. 
 
+    include <rotate_p.scad>;
+
 	radius = 40;
 	step_angle = 10;
 	z_circles = 20;