no syntax highlighting of the example tracebacks

Author: gpshead

peps/pep-9999.rst

@@ -61,7 +61,9 @@ ordering::
             tg.create_task(fetch_recommendations(uid))
             tg.create_task(fetch_inventory(['widget-42']))
 
-With ``PYTHON_TRACEBACK_TIMESTAMPS=iso``, the output becomes::
+With ``PYTHON_TRACEBACK_TIMESTAMPS=iso``, the output becomes:
+
+.. code-block:: text
 
     Traceback (most recent call last):
       ...
@@ -145,7 +147,9 @@ Display Format
 --------------
 
 Timestamps are appended to the exception message line in tracebacks using
-the format ``<@timestamp>``.  Example with ``iso``::
+the format ``<@timestamp>``.  Example with ``iso``:
+
+.. code-block:: text
 
     Traceback (most recent call last):
       File "<stdin>", line 3, in california_raisin