translate the "napi.rst" into Simplified Chinese.
Update to commit bf1b8e0abc39("documentation: networking: Add NAPI config")
Signed-off-by: Wang Yaxin <wang.yaxin@zte.com.cn>
Signed-off-by: Jiang Kun <jiang.kun2@zte.com.cn>
Signed-off-by: xu xin <xu.xin16@zte.com.cn>
Reviewed-by: Yanteng Si <si.yanteng@linux.dev>
Signed-off-by: Alex Shi <alexs@kernel.org>
