update doc

docs/lib2x-ptf_bend.md

@@ -2,7 +2,7 @@
 
 Transforms a point inside a rectangle to a point of an arc.
 
-**Since:** 2.3.
+**Since:** 2.3
 
 ## Parameters
 

docs/lib2x-ptf_circle.md

@@ -4,7 +4,7 @@ Transform a point inside a rectangle to a point inside a circle. You can use it
 
 ![ptf_circle](images/lib2x-ptf_circle-1.JPG)
 
-**Since:** 2.3.
+**Since:** 2.3
 
 ## Parameters
 

docs/lib2x-ptf_rotate.md

@@ -2,6 +2,8 @@
 
 Rotates a point `a` degrees around the axis of the coordinate system or an arbitrary axis. It behaves as the built-in `rotate` module
 
+**Since:** 2.3
+
 ## Parameters
 
 - `point` : A 3D point `[x, y, z]` or a 2D point `[x, y]`.

docs/lib2x-ptf_x_twist.md

@@ -4,7 +4,7 @@ Twist a point along the x-axis. You can use it to create something such as a [tw
 
 ![ptf_x_twist](images/lib2x-ptf_x_twist-2.JPG)
 
-**Since:** 2.3.
+**Since:** 2.3
 
 ## Parameters
 

docs/lib2x-ptf_y_twist.md

@@ -4,7 +4,7 @@ Twist a point along the y-axis. You can use it to create something such as a [tw
 
 ![ptf_y_twist](images/lib2x-ptf_y_twist-2.JPG)
 
-**Since:** 2.3.
+**Since:** 2.3
 
 ## Parameters