Add docs to layer API

src/ifcopenshell-python/ifcopenshell/api/group/edit_group.py

@@ -37,7 +37,6 @@ class Usecase:
             ifcopenshell.api.run("group.edit_group", model,
                 group=group, attributes={"Description": "All furniture and joinery included in the unit"})
         """
-
         self.file = file
         self.settings = {"group": group, "attributes": attributes or {}}
 

src/ifcopenshell-python/ifcopenshell/api/group/unassign_group.py

@@ -28,7 +28,7 @@ class Usecase:
 
         :param product: A IfcProduct element to unassign from the group
         :type product: ifcopenshell.entity_instance.entity_instance
-        :param group: The IfcGroup to assign the products to
+        :param group: The IfcGroup to unassign from
         :type group: ifcopenshell.entity_instance.entity_instance
         :return: None
         :rtype: None