Fix typo in comet.py (#16326)

Author: eltociear

src/pytorch_lightning/loggers/comet.py

@@ -160,7 +160,7 @@ def __init__(self, *args, **kwarg):
         audio = "<path to audio data>"
         logger.experiment.log_audio(audio, file_name="my_audio.wav")
 
-    Log arbitary data assets:
+    Log arbitrary data assets:
 
     You can log any type of data to Comet as an asset. These can be model
     checkpoints, datasets, debug logs, etc.