Remove None-Existed floder and add Existed floder (#3881)

* Update README.md

* Apply suggestions from code review

* Apply suggestions from code review

examples/aishell/README.md

@@ -2,7 +2,8 @@
 
 * asr0 - deepspeech2 Streaming/Non-Streaming
 * asr1 - transformer/conformer Streaming/Non-Streaming
-* asr2 - transformer/conformer Streaming/Non-Streaming with Kaldi feature
+* ~~asr2 - transformer/conformer Streaming/Non-Streaming with Kaldi feature~~
+* asr3 - wav2vec2 Non-Streaming
 
 
 ## Data