Make syntax highlighting explicit in docs

src/ifcopenshell-python/ifcopenshell/api/pset_template/add_prop_template.py

@@ -68,7 +68,9 @@ class Usecase:
         :return: The newly created IfcSimplePropertyTemplate.
         :rtype: ifcopenshell.entity_instance.entity_instance
 
-        Example::
+        Example:
+
+        .. code:: python
 
             # Create a simple template that may be applied to all types
             template = ifcopenshell.api.run("pset_template.add_pset_template", model, name="ABC_RiskFactors")