Update SDK_tutorial_zh.md

zhifu gao

2023-07-02 61c5c36c9643435a6e160508b5d46deebcf7459e

 egs_modelscope/vad/speech_fsmn_vad_zh-cn-8k-common/demo_online.py

@@ -7,7 +7,7 @@
import soundfile

if __name__ == '__main__':
    output_dir = None
    output_dir = "./results"
    inference_pipeline = pipeline(
        task=Tasks.voice_activity_detection,
        model="damo/speech_fsmn_vad_zh-cn-8k-common",