cleanup, docs

site/doc/pages/2_DValue_set_reference.txt

@@ -12,6 +12,6 @@ return value : none
 :content
 Stores an internal reference to another `DValue`. Most unit code should not need to create references directly; normal reads and writes generally follow existing references automatically.
 
-```cpp
-alias.set_reference(&context.call["state"]);
-```
+
+:example
+print("DValue::set_reference example\n");