Update pdb.rst

Author: donBarbos

Doc/library/pdb.rst

@@ -78,9 +78,7 @@ The debugger's prompt is ``(Pdb)``, which is the indicator that you are in debug
 .. program:: pdb
 
 You can also invoke :mod:`pdb` from the command line to debug other scripts.  For
-example:
-
-.. code-block:: bash
+example::
 
    python -m pdb [-c command] (-m module | pyfile) [args ...]