Make syntax highlighting explicit in docs

src/ifcopenshell-python/ifcopenshell/api/context/add_context.py

@@ -107,7 +107,9 @@ class Usecase:
             IfcGeometricRepresentationSubContext entity
         :rtype: ifcopenshell.entity_instance.entity_instance, optional
 
-        Example::
+        Example:
+
+        .. code:: python
 
             # If we plan to store 3D geometry in our IFC model, we have to setup
             # a "Model" context.

src/ifcopenshell-python/ifcopenshell/api/context/edit_context.py

@@ -31,7 +31,9 @@ class Usecase:
         :return: None
         :rtype: None
 
-        Example::
+        Example:
+
+        .. code:: python
 
             model = ifcopenshell.api.run("context.add_context", model, context_type="Model")
             # Revit had a bug where they incorrectly called the body representation a "Facetation"

src/ifcopenshell-python/ifcopenshell/api/context/remove_context.py

@@ -31,7 +31,9 @@ class Usecase:
         :return: None
         :rtype: None
 
-        Example::
+        Example:
+
+        .. code:: python
 
             model = ifcopenshell.api.run("context.add_context", model, context_type="Model")
             # Revit had a bug where they incorrectly called the body representation a "Facetation"