binary-distribution-format: Update a mention of distutils

Author: geofft

source/specifications/binary-distribution-format.rst

@@ -43,8 +43,8 @@ Wheel installation notionally consists of two phases:
      destination path. Each subdirectory of ``distribution-1.0.data/``
      is a key into a dict of destination directories, such as
      ``distribution-1.0.data/(purelib|platlib|headers|scripts|data)``.
-     The initially supported paths are taken from
-     ``distutils.command.install``.
+     These subdirectories are `installation paths defined by sysconfig
+     <https://docs.python.org/3/library/sysconfig.html#installation-paths>`_.
   c. If applicable, update scripts starting with ``#!python`` to point
      to the correct interpreter.
   d. Update ``distribution-1.0.dist-info/RECORD`` with the installed