Update README.md

demos/speech_recognition/README.md

@@ -26,7 +26,7 @@ wget -c https://paddlespeech.bj.bcebos.com/PaddleAudio/zh.wav https://paddlespee
   ```bash
   paddlespeech asr --input ./zh.wav
   ```
-  (It doesn't matter if package `paddlespeech-ctcdecoders` is not found, the package is optional.)
+  (It doesn't matter if package `paddlespeech-ctcdecoders` is not found, this package is optional.)
   
   Usage:
   ```bash