doc: fixed einsum tree

RivinHD · RivinHD · commit fb1a40fa4de3 · 2025-07-29T15:16:45.000+02:00
diff --git a/docs_sphinx/chapters/einsum_trees.rst b/docs_sphinx/chapters/einsum_trees.rst
@@ -450,7 +450,7 @@ Implementation of the heuristic:
 
 Einsum tree:
 
-.. code-block::
+.. code-block:: vim
 
    0,1,2,3,4
    ├─ 7,3,4
