Fix regendoc

The finalizers example was wiping out code needed for the examples below.

Author: nicoddemus

doc/en/how-to/fixtures.rst

@@ -744,10 +744,10 @@ Note on finalizer order
 Finalizers are executed in a first-in-last-out order.
 For yield fixtures, the first teardown code to run is from the right-most fixture, i.e. the last test parameter.
 
-.. regendoc:wipe
 
 .. code-block:: python
 
+    # content of test_finalizers.py
     import pytest
 
 
@@ -769,7 +769,7 @@ For yield fixtures, the first teardown code to run is from the right-most fixtur
 
 .. code-block:: pytest
 
-    $ pytest test_module.py
+    $ pytest test_finalizers.py
     =========================== test session starts ============================
     platform linux -- Python 3.x.y, pytest-7.x.y, pluggy-1.x.y
     collected 1 item
@@ -784,6 +784,7 @@ For finalizers, the first fixture to run is last call to `request.addfinalizer`.
 
 .. code-block:: python
 
+    # content of test_finalizers.py
     import pytest
 
 
@@ -799,7 +800,7 @@ For finalizers, the first fixture to run is last call to `request.addfinalizer`.
 
 .. code-block:: pytest
 
-    $ pytest test_module.py
+    $ pytest test_finalizers.py
     =========================== test session starts ============================
     platform linux -- Python 3.x.y, pytest-7.x.y, pluggy-1.x.y
     collected 1 item