doc: fix/remove leftovers from removing versionadded (#7028)

Ref: 9c5da9c (#5184)

Author: blueyed

doc/en/assert.rst

@@ -342,15 +342,3 @@ If this is the case you have two options:
   ``PYTEST_DONT_REWRITE`` to its docstring.
 
 * Disable rewriting for all modules by using ``--assert=plain``.
-
-
-
-   Add assert rewriting as an alternate introspection technique.
-
-
-   Introduce the ``--assert`` option. Deprecate ``--no-assert`` and
-   ``--nomagic``.
-
-
-   Removes the ``--no-assert`` and ``--nomagic`` options.
-   Removes the ``--assert=reinterp`` option.