Make syntax highlighting explicit in docs

src/ifcopenshell-python/ifcopenshell/api/sequence/add_work_time.py

@@ -38,7 +38,9 @@ class Usecase:
         :return: The newly created IfcWorkTime
         :rtype: ifcopenshell.entity_instance.entity_instance
 
-        Example::
+        Example:
+
+        .. code:: python
 
             # Let's create a new calendar.
             calendar = ifcopenshell.api.run("sequence.add_work_calendar", model)