#4041: don't refer to removed and outdated modules.

Doc/library/functions.rst

@@ -24,10 +24,8 @@ available.  They are listed here in alphabetical order.
    The function is invoked by the :keyword:`import` statement.  It mainly exists
    so that you can replace it with another function that has a compatible
    interface, in order to change the semantics of the :keyword:`import` statement.
-   For examples of why and how you would do this, see the standard library modules
-   :mod:`ihooks` and :mod:`rexec`.  See also the built-in module :mod:`imp`, which
-   defines some useful operations out of which you can build your own
-   :func:`__import__` function.
+   See the built-in module :mod:`imp`, which defines some useful operations out
+   of which you can build your own :func:`__import__` function.
 
    For example, the statement ``import spam`` results in the following call:
    ``__import__('spam', globals(), locals(), [], -1)``; the statement