ref-manual/variable: remove obsolete SETUPTOOLS_INSTALL_ARGS

Remove in oecore by commit b4bdfc78e8e1cb8b86221bc55d80d601ea1a065f
("python3-cython: remove obsolete SETUPTOOLS_INSTALL_ARGS").

Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>
(From yocto-docs rev: a32b39a4d9bda124e6c19aa1db522656b1e7e807)

Signed-off-by: Antonin Godard <antonin.godard@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/variables.rst

@@ -7843,11 +7843,6 @@ system and gives an overview of their function and contents.
       class, this variable can be used to specify additional arguments to be
       passed to ``setup.py build`` in the ``setuptools3_do_compile()`` task.
 
-   :term:`SETUPTOOLS_INSTALL_ARGS`
-      When used by recipes that inherit the :ref:`ref-classes-setuptools3`
-      class, this variable can be used to specify additional arguments to be
-      passed to ``setup.py install`` in the ``setuptools3_do_install()`` task.
-
    :term:`SETUPTOOLS_SETUP_PATH`
       When used by recipes that inherit the :ref:`ref-classes-setuptools3`
       class, this variable should be used to specify the directory in which