Unify doc-strings (remove type/rtype)

As this information is already provided in type hints and we don't need to maintain it in two places.

src/ifcopenshell-python/ifcopenshell/api/style/unassign_representation_styles.py

@@ -31,20 +31,16 @@ def unassign_representation_styles(
 
     :param shape_representation: The IfcShapeRepresentation of the object
         that you want to unassign styles from.
-    :type shape_representation: ifcopenshell.entity_instance
     :param styles: A list of presentation styles, typically IfcSurfaceStyle.
         The number of items in the list should correlate with the number of
         items in the shape_representation's Items attribute. If you have
         more items than styles, the last style is used.
-    :type styles: list[ifcopenshell.entity_instance]
     :param should_use_presentation_style_assignment: This is a technical
         detail to accomodate a bug in Revit. This should always be left as
         the default of False, unless you are finding that colours aren't
         showing up in Revit. In that case, set it to True, but keep in mind
         that this is no longer a valid IFC. Blame Autodesk.
-    :type should_use_presentation_style_assignment: bool
     :return: None
-    :rtype: None
 
     Example: