update doc

docs/lib2-m_cumulate.md

@@ -6,6 +6,8 @@ The power of using transformation matrice is that you can cumulate all transform
 
 ## Parameters
 
+The dir changed since 2.0. 
+
 - `matrice` : A list of 4x4 transformation matrice.
 
 ## Examples

docs/lib2-m_mirror.md

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 # m_mirror
 
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+
 Generate a 4x4 transformation matrix which can pass into `multmatrix` to mirror the child element on a plane through the origin. 
 
 **Since:** 1.1

docs/lib2-m_rotation.md

@@ -1,5 +1,7 @@
 # m_rotation
 
+The dir changed since 2.0. 
+
 Generate a 4x4 transformation matrix which can pass into `multmatrix` to rotate the child element about the axis of the coordinate system or around an arbitrary axis. 
 
 **Since:** 1.1

docs/lib2-m_scaling.md

@@ -1,5 +1,7 @@
 # m_scaling
 
+The dir changed since 2.0. 
+
 Generate a 4x4 transformation matrix which can pass into `multmatrix` to scale its child elements using the specified vector.
 
 **Since:** 1.1

docs/lib2-m_shearing.md

@@ -1,5 +1,7 @@
 # m_shearing
 
+The dir changed since 2.0. 
+
 Generate a 4x4 transformation matrix which can pass into `multmatrix` to shear all child elements along the X-axis, Y-axis, or Z-axis in 3D.
 
 **Since:** 1.1

docs/lib2-m_translation.md

@@ -1,5 +1,7 @@
 # m_translation
 
+The dir changed since 2.0. 
+
 Generate a 4x4 transformation matrix which can pass into `multmatrix` to translates (moves) its child elements along the specified vector.
 
 **Since:** 1.1

docs/lib2-parse_number.md

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 # parse_number
 
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+
 Parses the string argument as an number. 
 
 ## Parameters

docs/lib2-split_str.md

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 # split_str
 
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+
 Splits the given string around matches of the given delimiting character. 
 
 ## Parameters

docs/lib2-sub_str.md

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 # sub_str
 
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+
 Returns a new string that is a substring of the given string.
 
 ## Parameters

docs/lib2-turtle2d.md

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 # turtle2d
 
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+
 An OpenSCAD implementation of Turtle Graphics. It moves on the xy plane. You can get the cooridinate `[x, y]` or `angle` of its current position.
 
 ## Parameters

docs/lib2-turtle3d.md

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 # turtle3d
 
+The dir changed since 2.0. 
+
 An OpenSCAD implementation of 3D Turtle Graphics. When using the function, imagine that you are sitting on the turtle. You move or turn the turtle from the your viewpoint, not the viewpoint of OpenSCAD coordinates.
 
 For more details, please see [3D turtle graphics](https://openhome.cc/eGossip/OpenSCAD/3DTurtleGraphics.html).