Add microphone streaming ASR example for C API (#650)

c-api-examples/decode-file-c-api.c

@@ -157,7 +157,7 @@ int32_t main(int32_t argc, char *argv[]) {
         break;
       }
       default:
-        // do nothing as config already have valid default values
+        // do nothing as config already has valid default values
         break;
     }
   }