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 ````.

For modules which do have a command-line interface, lists of options
have been properly marked up with the program/cmdoption directives
combo.  Options defined in such blocks can be linked to with :option:
later in the same file, they won’t link to an option of python.

Finally, the markup of command-line fragments in optparse.rst has
been cleaned to use ``x`` instead of ``"x"``, keeping that latter
form for actual Python strings.

Patch by Eli Bendersky and Éric Araujo.
diff --git a/Doc/library/idle.rst b/Doc/library/idle.rst
index 1b78fb9..6bd1898 100644
--- a/Doc/library/idle.rst
+++ b/Doc/library/idle.rst
@@ -286,13 +286,13 @@
 
 If there are arguments:
 
-#. If :option:`-e` is used, arguments are files opened for editing and
+#. If ``-e`` is used, arguments are files opened for editing and
    ``sys.argv`` reflects the arguments passed to IDLE itself.
 
-#. Otherwise, if :option:`-c` is used, all arguments are placed in
+#. Otherwise, if ``-c`` is used, all arguments are placed in
    ``sys.argv[1:...]``, with ``sys.argv[0]`` set to ``'-c'``.
 
-#. Otherwise, if neither :option:`-e` nor :option:`-c` is used, the first
+#. Otherwise, if neither ``-e`` nor ``-c`` is used, the first
    argument is a script which is executed with the remaining arguments in
    ``sys.argv[1:...]``  and ``sys.argv[0]`` set to the script name.  If the script
    name is '-', no script is executed but an interactive Python session is started;