cleanup, docs

site/doc/pages/2_DValue_operator_index.txt

@@ -17,6 +17,6 @@ return value : reference to the child node
 :content
 Returns a mutable reference to a child, creating the child when it does not already exist. If this value is an internal reference, the operation is forwarded to the target. This has the same creation behavior as `get_or_create()`, so use `has()`, `key()`, or `get_by_path()` for non-mutating reads.
 
-```cpp
-context.call["user"]["name"] = "Ada";
-```
+
+:example
+print("DValue::operator_index example\n");