doc MAINTENANCE fix doxygen formatting
diff --git a/src/tree_data.h b/src/tree_data.h
index 9eb7202..4af56c9 100644
--- a/src/tree_data.h
+++ b/src/tree_data.h
@@ -276,17 +276,20 @@
* - The order of the changed (#LYD_DIFF_CHANGED) and created (#LYD_DIFF_CREATED) follows the nodes order in the
* second tree - the current siblings are processed first and then the children are processed. Note, that this is
* actually not the BFS:
+ *
* 1 2
* / \ / \
* 3 4 7 8
* / \
* 5 6
+ *
* - The order of the deleted (#LYD_DIFF_DELETED) nodes is the DFS:
- * 1 6
- * / \ / \
- * 2 5 7 8
- * / \
- * 3 4
+ *
+ * 1 6
+ * / \ / \
+ * 2 5 7 8
+ * / \
+ * 3 4
*
* To change the first tree into the second one, it is necessary to follow the order of transactions described in
* the result. Note, that it is not possible just to use the transactions in the reverse order to transform the