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/doctest.rst b/Doc/library/doctest.rst
index 795c074..159ab18 100644
--- a/Doc/library/doctest.rst
+++ b/Doc/library/doctest.rst
@@ -88,7 +88,7 @@
    $
 
 There's no output!  That's normal, and it means all the examples worked.  Pass
-:option:`-v` to the script, and :mod:`doctest` prints a detailed log of what
+``-v`` to the script, and :mod:`doctest` prints a detailed log of what
 it's trying, and prints a summary at the end::
 
    $ python example.py -v
@@ -151,7 +151,7 @@
 final line of output is ``***Test Failed*** N failures.``, where *N* is the
 number of examples that failed.
 
-Run it with the :option:`-v` switch instead::
+Run it with the ``-v`` switch instead::
 
    python M.py -v
 
@@ -160,7 +160,7 @@
 
 You can force verbose mode by passing ``verbose=True`` to :func:`testmod`, or
 prohibit it by passing ``verbose=False``.  In either of those cases,
-``sys.argv`` is not examined by :func:`testmod` (so passing :option:`-v` or not
+``sys.argv`` is not examined by :func:`testmod` (so passing ``-v`` or not
 has no effect).
 
 There is also a command line shortcut for running :func:`testmod`.  You can
@@ -229,7 +229,7 @@
 that can be used to tell it to look for files in other locations.
 
 Like :func:`testmod`, :func:`testfile`'s verbosity can be set with the
-:option:`-v` command-line switch or with the optional keyword argument
+``-v`` command-line switch or with the optional keyword argument
 *verbose*.
 
 There is also a command line shortcut for running :func:`testfile`.  You can
@@ -1377,7 +1377,7 @@
    verbosity.  If *verbose* is ``True``, then information is printed about each
    example, as it is run.  If *verbose* is ``False``, then only failures are
    printed.  If *verbose* is unspecified, or ``None``, then verbose output is used
-   iff the command-line switch :option:`-v` is used.
+   iff the command-line switch ``-v`` is used.
 
    The optional keyword argument *optionflags* can be used to control how the test
    runner compares expected output to actual output, and how it displays failures.