Fix punctuation in `Doc/library/concurrent.interpreters.rst` (GH-153894)
(cherry picked from commit
6ebb22cb83d8ce05f7136166d1674d0a14a29459)
Co-authored-by: Raúl Santos Quirós <130504291+raul-sq@users.noreply.github.com>
For concurrency, interpreters themselves (and this module) don't
provide much more than isolation, which on its own isn't useful.
Actual concurrency is available separately through
-:mod:`threads <threading>` See `below <interp-concurrency_>`_
+:mod:`threads <threading>` -- see `below <interp-concurrency_>`_.
.. seealso::