cleanup, docs

site/doc/pages/2_DValue_is_reference.txt

@@ -12,6 +12,6 @@ return value : true when this node itself is a reference node
 :content
 Reports whether the current node's direct type tag is the internal reference tag. Most read methods dereference automatically; this helper is mainly useful when handling reference-aware runtime state.
 
-```cpp
-if(value.is_reference()) print("reference");
-```
+
+:example
+print("DValue::is_reference example\n");