The get_abi.pl script was replaced by get_abi.py. Update it at docs
makefile.

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202502110736.ZGWaWsep-lkp@intel.com/


Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/20250211054446.1696826-1-mchehab+huawei@kernel.org


Signed-off-by: Jonathan Corbet <corbet@lwn.net>