modify paraformer train doc (#1427)

seanzhang-zhichen

2024-03-05 9595a9432fadfbdacd4e6897f6b9a83957699558

1
2
wget https://isv-data.oss-cn-hangzhou.aliyuncs.com/ics/MaaS/ASR/dep_libs/ffmpeg-N-111383-g20b8688092-linux64-gpl-shared.tar.xz
tar -xvf ffmpeg-N-111383-g20b8688092-linux64-gpl-shared.tar.xz