Add subtype to AST node warning

Author: fajpunk

README.md

@@ -95,6 +95,7 @@ The following configuration options are accepted:
   - `sphinx_autodoc_typehints.forward_reference`
   - `sphinx_autodoc_typehints.guarded_import`
   - `sphinx_autodoc_typehints.local_function`
+  - `sphinx_autodoc_typehints.multiple_ast_nodes`
 
 ## How it works
 

src/sphinx_autodoc_typehints/__init__.py

@@ -572,6 +572,7 @@ def _one_child(module: Module) -> stmt | None:
                 name,
                 len(children),
                 type="sphinx_autodoc_typehints",
+                subtype="multiple_ast_nodes",
             )
             return None
         return children[0]