Update Doc/using/configure.rst

Co-authored-by: Victor Stinner <vstinner@python.org>

Author: skirpichev

Doc/using/configure.rst

@@ -29,8 +29,8 @@ Features and minimum versions required to build CPython:
 
 * Tcl/Tk 8.5.12 for the :mod:`tkinter` module.
 
-* The `libmpdec <https://www.bytereef.org/mpdecimal/doc/libmpdec/index.html>`_
-  library, minimum version 2.5.0, is recommended for the :mod:`decimal` module.
+* `libmpdec <https://www.bytereef.org/mpdecimal/doc/libmpdec/>`_ 2.5.0
+  for the :mod:`decimal` module.
 
 * Autoconf 2.72 and aclocal 1.16.5 are required to regenerate the
   :file:`configure` script.