Typo fixes for .Net examples (#258)

dotnet-examples/online-decode-files/Program.cs

@@ -96,7 +96,7 @@ dotnet run \
   --num-threads=2 \
   --decoding-method=modified_beam_search \
   --debug=false \
-  ./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/test_wavs/0.wav \
+  --files ./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/test_wavs/0.wav \
   ./sherpa-onnx-streaming-zipformer-bilingual-zh-en-2023-02-20/test_wavs/1.wav
 
 Please refer to

dotnet-examples/speech-recognition-from-microphone/Program.cs

@@ -16,7 +16,7 @@ using System.Runtime.InteropServices;
 using System;
 
 
-class OnlineDecodeFiles
+class SpeechRecognitionFromMicrophone
 {
   class Options
   {
@@ -192,6 +192,7 @@ to download pre-trained streaming models.
         );
 
     Console.WriteLine(param);
+    Console.WriteLine("Started! Please speak");
 
     stream.Start();