Update peps/pep-0810.rst

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>

Author: Yhg1s

peps/pep-0810.rst

@@ -810,7 +810,7 @@ When a lazy import fails during reification, the original exception is preserved
 and chained, showing both where the import was defined and where it was first
 used:
 
-.. code-block:: python
+.. code-block:: pytb
 
   Traceback (most recent call last):
     File "test.py", line 1, in <module>