Update README.md

README.md

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 ### Dataset Summary
 
 The dataset contains 25,000 hours of Chinese Dialect speech data. It's collected from local dialect speakers in multiple dialect regions, covering Hokkien, Cantonese, Sichuan Dialect, Henan Dialects,Northeastern Dialect, Shanghai Dialect,Uyghur and Tibetan etc. The format is 16kHz, 16bit, uncompressed wav, mono channel. The sentence accuracy is over 95%.                                                                                                                                     
-For more details, please refer to the link: https://nexdata.ai/speechRecognition?source=Huggingface
+For more details, please refer to the link: https://www.nexdata.ai/datasets/speechrecog?source=Huggingface
 
 
 ### Supported Tasks and Leaderboards