cleanup, docs

site/doc/pages/2_DValue_key.txt

@@ -14,6 +14,6 @@ return value : pointer to existing child, or 0
 :content
 Looks up one child without creating it. The non-const overload forwards through references; both overloads return `0` for scalars or missing keys.
 
-```cpp
-if(const DValue* user = payload.key("user")) print(user->to_json());
-```
+
+:example
+print("DValue::key example\n");