update the streaming asr english note, test=doc

demos/README.md

@@ -11,7 +11,7 @@ The directory containes many speech applications in multi scenarios.
 * punctuation_restoration - restore punctuation from raw text
 * speech recogintion - recognize text of an audio file 
 * speech server - Server for Speech Task, e.g. ASR,TTS,CLS
-* streaming asr server - input the audio streaming to recognize the text
+* streaming asr server - receive audio stream from websocket, and recognize to transcript.
 * speech translation - end to end speech translation  
 * story talker - book reader based on OCR and TTS  
 * style_fs2 - multi style control for FastSpeech2 model