join: remove [-p] and show example using seq tool in help
join: remove [-p] and show example using seq tool in help

sidward/bart,grlee77/bart,mrirecon/bart,grlee77/bart,Takishima/bart,sdimoudi/bart,grlee77/bart,Takishima/bart,frankong/bart,nckz/bart,sdimoudi/bart,sdimoudi/bart,nckz/bart,grlee77/bart,sidward/bart,Takishima/bart,mrirecon/bart,frankong/bart,mjacob75/bart,sidward/bart,sdimoudi/bart,nckz/bart,mjacob75/bart,Takishima/bart,frankong/bart,mrirecon/bart,mjacob75/bart,frankong/bart,sdimoudi/bart,sidward/bart,Takishima/bart,mjacob75/bart,nckz/bart,frankong/bart,mjacob75/bart,nckz/bart,grlee77/bart,mrirecon/bart,mrirecon/bart,sidward/bart