[3.11] gh-97850: Remove the open issues section from the import reference (GH-97935) (GH-97994)

Remove the open issues section from the import reference

Tracking in https://github.com/python/cpython/issues/97850 instead.
(cherry picked from commit f8edc6ff531bb98858185857513371f14519ed1d)


Co-authored-by: Brett Cannon <brett@python.org>

Automerge-Triggered-By: GH:brettcannon