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/add_surface_textures.py

@@ -37,11 +37,9 @@ def add_surface_textures(
     :param material: The Blender material definition with a node tree that
         is compatible with glTF. See one of the valid combinations here:
         https://docs.blender.org/manual/en/dev/addons/import_export/scene_gltf2.html
-    :type material: bpy.types.Material, optional
     :param uv_maps: A list of IfcIndexedTextureMap for any
         IfcTessellatedFaceSets that the representation has, obtained from
         the HasTextures attribute.
-    :type uv_maps: list[ifcopenshell.entity_instance]
     :param textures: A list of dictionaries containing:
 
         1. Attributes to create IfcImageTexture.
@@ -55,9 +53,7 @@ def add_surface_textures(
           based on geometry);
         * `Camera` - IfcTextureCoordinateGenerator with mode COORD_EYE (autogenerated UV
           based on camera position)
-    :type textures: list[dict], optional
     :return: A list of IfcImageTexture
-    :rtype: list[ifcopenshell.entity_instance]
     """
     usecase = Usecase()
     # TODO: This usecase currently depends on Blender's data model