doc: replace deprecated distutils version parsing

doc: replace deprecated distutils version parsing

When using Python 3.10, this warning appears:
  DeprecationWarning: The distutils package is deprecated
  and slated for removal in Python 3.12.
  Use setuptools or check PEP 632 for potential alternatives

The PEP 632 recommends replacing "distutils.version" with "packaging".

Bugzilla ID: 914
Cc: stable@dpdk.org
Reported-by: Jerin Jacob <jerinj@marvell.com>
Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Tested-by: Jerin Jacob <jerinj@marvell.com>