Fix typo in espnet2_format_wav_scp.md

doc/espnet2_format_wav_scp.md

@@ -35,7 +35,7 @@ cd egs2/some_corpus/some_task
 
 cmd=utils/run.pl
 nj=10  # Number of parallel jobs
-audio_fomrat=flac  # The audio codec of output files
+audio_format=flac  # The audio codec of output files
 fs=16k  # The sampling frequency of output files
 ref_channels=0  # If the input data has multiple channels and you want to use only a single channel in the file (please spicify the channel with 0-based number)
 ./scripts/audio/format_wav_scp.sh --nj "${nj}" --cmd "${cmd}" --audio_format "${audio_format}" --fs "${fs}" --ref_channels "${ref_channels}" somewhere/wav.scp output_dir