Fix audio docs (#740)

Author: scotts

examples/audio_decoding.py

@@ -95,7 +95,7 @@ def play_audio(samples):
 # We can also decode the samples into a desired sample rate using the
 # ``sample_rate`` parameter of :class:`~torchcodec.decoders.AudioDecoder`. The
 # ouput will sound similar, but note that the number of samples greatly
-# decreased:```
+# decreased:
 
 decoder = AudioDecoder(raw_audio_bytes, sample_rate=16_000)
 samples = decoder.get_all_samples()