Update old function params

As per Gradio Documentation, some of the params aren't used anymore and the code doesn't work. 
- Audio source now is sources and gets a list
- Audio doesn't have an 'optional' parameter
- Textbox type gets just ['text', 'password', 'email'] not 'number'

chapters/en/chapter9/3.mdx

@@ -64,7 +64,7 @@ def reverse_audio(audio):
     return reversed_audio
 
 
-mic = gr.Audio(source="microphone", type="numpy", label="Speak here...")
+mic = gr.Audio(sources=["microphone"], type="numpy", label="Speak here...")
 gr.Interface(reverse_audio, mic, "audio").launch()
 ```
 
@@ -112,7 +112,7 @@ gr.Interface(
     [
         gr.Dropdown(notes, type="index"),
         gr.Slider(minimum=4, maximum=6, step=1),
-        gr.Textbox(type="number", value=1, label="Duration in seconds"),
+        gr.Textbox(value=1, label="Duration in seconds"),
     ],
     "audio",
 ).launch()
@@ -167,8 +167,8 @@ def transcribe_audio(mic=None, file=None):
 gr.Interface(
     fn=transcribe_audio,
     inputs=[
-        gr.Audio(source="microphone", type="filepath", optional=True),
-        gr.Audio(source="upload", type="filepath", optional=True),
+        gr.Audio(sources=["microphone"], type="filepath"),
+        gr.Audio(sources=["upload"], type="filepath"),
     ],
     outputs="text",
 ).launch()
@@ -183,4 +183,4 @@ That's it! You can now use this interface to transcribe audio. Notice here that
 by passing in the `optional` parameter as `True`, we allow the user to either
 provide a microphone or an audio file (or neither, but that will return an error message).
 
-Keep going to see how to share your interface with others!
+Keep going to see how to share your interface with others!