Remove wrong usage of :option:

From http://www.sphinx-doc.org/en/stable/domains.html#directive-option:

  > The directive will create cross-reference targets for the given options,
  > referencable by option (in the example case, you’d use something like
  > :option:`dest_dir`, :option:`-m`, or :option:`--module`).

I don't think we're intending here to create cross references,
we simply want to render it nicely.

So just use code formatting instead.

This gets rid of the last build warnings.

docs/dev/env.rst

@@ -38,7 +38,7 @@ over the syntax file included in Vim 6.1.
 These plugins supply you with a basic environment for developing in Python.
 To get the most out of Vim, you should continually check your code for syntax
 errors and PEP8 compliance. Luckily PEP8_ and Pyflakes_ will do this for you.
-If your Vim is compiled with :option:`+python` you can also utilize some very
+If your Vim is compiled with ``+python`` you can also utilize some very
 handy plugins to do these checks from within the editor.
 
 For PEP8 checking and pyflakes, you can install vim-flake8_. Now you can map the

docs/dev/virtualenvs.rst

@@ -93,7 +93,7 @@ where they were placed.
 Other Notes
 ~~~~~~~~~~~
 
-Running ``virtualenv`` with the option :option:`--no-site-packages` will not
+Running ``virtualenv`` with the option ``--no-site-packages`` will not
 include the packages that are installed globally. This can be useful
 for keeping the package list clean in case it needs to be accessed later.
 [This is the default behavior for ``virtualenv`` 1.7 and later.]

docs/shipping/freezing.rst

@@ -60,7 +60,7 @@ py2app      no      no    yes  yes      MIT     no            yes            yes
 .. note::
     All solutions need MS Visual C++ dll to be installed on target machine, except py2app.
     Only Pyinstaller makes self-executable exe that bundles the dll when
-    passing :option:`--onefile` to :file:`Configure.py`.
+    passing ``--onefile`` to :file:`Configure.py`.
 
 Windows
 -------

docs/shipping/packaging.rst

@@ -101,7 +101,7 @@ pypiserver
 `Pypiserver <https://pypi.python.org/pypi/pypiserver>`_ is a minimal PyPI
 compatible server.  It can be used to serve a set of packages to easy_install
 or pip.  It includes helpful features like an administrative command
-(:option:`-U`) which will update all its packages to their latest versions
+(``-U``) which will update all its packages to their latest versions
 found on PyPI.