Update cq.py

As a user in the discord pointed it, the workplane method docs could be somehow not clear about what is the Z direction.

I removed the future enchancement that have been added since.
I also removed things that seemed odd and outdated to me feel free to revert the change if it was a mistake

Author: Jojain

cadquery/cq.py

@@ -503,15 +503,15 @@ def workplane(
         """
         Creates a new 2D workplane, located relative to the first face on the stack.
 
-        :param offset:  offset for the work plane in the Z direction. Default
-        :param invert:  invert the Z direction from that of the face.
+        :param offset:  offset for the workplane in it's normal direction . Default
+        :param invert:  invert the normal direction from that of the face.
         :param centerOption: how local origin of workplane is determined.
         :param origin: origin for plane center, requires 'ProjectedOrigin' centerOption.
         :type offset: float or None=0.0
         :type invert: boolean or None=False
         :type centerOption: string or None='ProjectedOrigin'
         :type origin: Vector or None
-        :rtype: Workplane object ( which is a subclass of CQ )
+        :rtype: Workplane object 
 
         The first element on the stack must be a face, a set of
         co-planar faces or a vertex.  If a vertex, then the parent
@@ -527,7 +527,7 @@ def workplane(
              face(s) or vertex (vertices). 'ProjectedOrigin' uses by default the current origin
              or the optional origin parameter (if specified) and projects it onto the plane
              defined by the selected face(s).
-           * The Z direction will be normal to the plane of the face,computed
+           * The Z direction will be the normal of the face,computed
              at the center point.
            * The X direction will be parallel to the x-y plane. If the workplane is  parallel to
              the global x-y plane, the x direction of the workplane will co-incide with the
@@ -537,14 +537,6 @@ def workplane(
         of the face ( IE, offset=0).  Occasionally, it is useful to define a face offset from
         an existing surface, and even more rarely to define a workplane based on a face that is
         not planar.
-
-        To create a workplane without first having a face, use the Workplane() method.
-
-        Future Enhancements:
-          * Allow creating workplane from planar wires
-          * Allow creating workplane based on an arbitrary point on a face, not just the center.
-            For now you can work around by creating a workplane and then offsetting the center
-            afterwards.
         """
 
         def _isCoPlanar(f0, f1):