Fix a few misuses of :option: I missed in r86521.

Extract of the commit message:

  Fix usage of :option: in the docs (#9312).

  :option: is used to create a link to an option of python, not to mark
  up any instance of any arbitrary command-line option.  These were
  changed to ````.
diff --git a/Doc/license.rst b/Doc/license.rst
index a32b7ab..b471828 100644
--- a/Doc/license.rst
+++ b/Doc/license.rst
@@ -845,7 +845,7 @@
 -----
 
 The :mod:`pyexpat` extension is built using an included copy of the expat
-sources unless the build is configured :option:`--with-system-expat`::
+sources unless the build is configured ``--with-system-expat``::
 
   Copyright (c) 1998, 1999, 2000 Thai Open Source Software Center Ltd
                                  and Clark Cooper
@@ -874,7 +874,7 @@
 ------
 
 The :mod:`_ctypes` extension is built using an included copy of the libffi
-sources unless the build is configured :option:`--with-system-libffi`::
+sources unless the build is configured ``--with-system-libffi``::
 
    Copyright (c) 1996-2008  Red Hat, Inc and others.