improves documentation

_doc/patches.rst

@@ -8,6 +8,7 @@ Function :func:`onnx_diagnostic.torch_export_patches.torch_export_patches`
 implements four kinds of patches to make it easier to export a model, usually
 coming from :epkg:`transformers`.
 All patches takes place in :mod:`onnx_diagnostic.torch_export_patches`.
+
 .. code-block:: python
 
     with torch_export_patches(...) as f:
@@ -121,13 +122,19 @@ requires the following value for parameter ``rewrite``:
 .. runpython::
     :showcode:
 
+    import pprint
     from onnx_diagnostic.torch_export_patches.patch_module_helper import (
         code_needing_rewriting,
     )
 
-    print(code_needing_rewriting("BartForConditionalGeneration"))    
+    pprint.pprint(code_needing_rewriting("BartForConditionalGeneration"))    
 
-And that produces:
+This method has two tests. Only the first one needs to be rewritten.
+The second one manipulates tuple and the automated rewritten does not handle
+that because it cannot detect types. That explains why the parameter
+``filter_node`` is filled. Then, the first test includes a condition relying on ``or``
+which must be replaced by ``|``. That explains the parameter ``pre_rewriter``.
+We finally get:
 
 .. code-block:: diff
 

onnx_diagnostic/torch_export_patches/patch_module_helper.py

@@ -30,11 +30,12 @@ def code_needing_rewriting(cls_name: str) -> Optional[List[Any]]:
     .. runpython::
         :showcode:
 
+        import pprint
         from onnx_diagnostic.torch_export_patches.patch_module_helper import (
             code_needing_rewriting,
         )
 
-        print(code_needing_rewriting("BartForConditionalGeneration"))
+        pprint.pprint(code_needing_rewriting("BartForConditionalGeneration"))
     """
     if cls_name in {
         "BartEncoderLayer",