Fix file suffix example: use "skel" not "wav" as suffix, and improve comment.
Fix file suffix example: use "skel" not "wav" as suffix, and improve
comment.

Motiejus/sox,MageSlayer/sox,Distrotech/sox,CaptainHayashi/sox,Distrotech/sox,cbagwell/sox,Motiejus/sox,CaptainHayashi/sox,davel/sox,pcqpcq/sox,Motiejus/sox,cbagwell/sox,pcqpcq/sox,pcqpcq/sox,cbagwell/sox,CaptainHayashi/sox,uklauer/sox,davel/sox,MageSlayer/sox,CaptainHayashi/sox,jacksonh/sox,MageSlayer/sox,MageSlayer/sox,MageSlayer/sox,Motiejus/sox,davel/sox,jacksonh/sox,Distrotech/sox,mhartzel/sox_personal_fork,uklauer/sox,cbagwell/sox,jacksonh/sox,pcqpcq/sox,jacksonh/sox,mhartzel/sox_personal_fork,mhartzel/sox_personal_fork,Distrotech/sox,uklauer/sox,uklauer/sox,mhartzel/sox_personal_fork,davel/sox