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/boundary/assign_connection_geometry.py

@@ -63,7 +63,6 @@ def assign_connection_geometry(
     :param unit_scale: The unit scale as calculated by
         ifcopenshell.util.unit.calculate_unit_scale. If not provided, it
         will be automatically calculated for you.
-    :type unit_scale: float, optional
     :return: None
 
     Example:

src/ifcopenshell-python/ifcopenshell/api/boundary/edit_attributes.py

@@ -33,25 +33,17 @@ def edit_attributes(
     manual assignment of the space boundary attributes.
 
     :param entity: The IfcRelSpaceBoundary to modify
-    :type entity: ifcopenshell.entity_instance
     :param relating_space: The IfcSpace or IfcExternalSpatialElement that
         the space boundary is related to.
-    :type relating_space: ifcopenshell.entity_instance
     :param related_building_element: The IfcElement that defines the
         boundary, typically an IfcWall.
-    :type relating_space: ifcopenshell.entity_instance
     :param parent_boundary: A parent IfcRelSpaceBoundary, only provided if
         this is an inner boundary. This can apply to 1st and 2nd level
         boundaries.
-    :type parent_boundary: ifcopenshell.entity_instance,
-        optional
     :param corresponding_boundary: The other IfcRelSpaceBoundary on the
         other side of the related element. The pair together represents a
         thermal boundary. This only applies to 2nd level boundaries.
-    :type corresponding_boundary: ifcopenshell.entity_instance,
-        optional
     :return: None
-    :rtype: None
     """
     entity = entity
     relating_space = relating_space