Finish the translation of kbuild/gcc-plugins.rst and move gcc-plugins
from TODO to the main body.

Update to commit 3832d1fd ("docs/core-api: expand Fedora instructions
for GCC plugins")
Signed-off-by: Dongliang Mu <dzm91@hust.edu.cn>
Reviewed-by: Alex Shi <alexs@kernel.org>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20240907070244.206808-1-dzm91@hust.edu.cn>