* ``I()`` for option names. For example: ``Required if I(state=present).`` This is italicized in
the documentation.
* ``C()`` for files and option values. For example: ``If not set the environment variable C(ACME_PASSWORD) will be used.`` This displays with a mono-space font in the documentation.
* ``C()`` for files, option values, and inline code. For example: ``If not set the environment variable C(ACME_PASSWORD) will be used.`` or ``Use C(var | foo.bar.my_filter) to transform C(var) into the required format.`` This displays with a mono-space font in the documentation.
* ``B()`` currently has no standardized usage. It is displayed in boldface in the documentation.
* ``HORIZONTALLINE`` is used sparingly as a separator in long descriptions. It becomes a horizontal rule (the ``<hr>`` html tag) in the documentation.