fix typo in intro of tutorial.txt
fix typo in intro of tutorial.txt

airodactyl/airodactyl,nathyong/dactyl,moonshadow/dactyl,Sheile/vimperator-labs,stemar94/vimperator-labs,zklinger/vimperator-labs,Kjwon15/dactyl,Quicksaver/vimperator-labs,nullren/vimperator-labs,moonshadow/dactyl,invl/dactyl,5digits/dactyl,invl/dactyl,derenio/vimperator-labs,nathyong/dactyl,Kjwon15/dactyl,Kjwon15/dactyl,moonshadow/dactyl,moonshadow/dactyl,airodactyl/dactyl,nathyong/dactyl,airodactyl/dactyl,seanmorton/vimperator-labs,airodactyl/dactyl,nullren/vimperator-labs,madand/pentadactyl-pm,stemar94/vimperator-labs,Kjwon15/dactyl,paretje/vimperator-labs,madand/pentadactyl-pm,airodactyl/dactyl,Sheile/vimperator-labs,5digits/dactyl,Kjwon15/dactyl,airodactyl/airodactyl,mcarton/vimperator-labs,Kjwon15/dactyl,madand/pentadactyl-pm,nathyong/dactyl,invl/dactyl,mcarton/vimperator-labs,5digits/dactyl,madand/pentadactyl-pm,5digits/dactyl,invl/dactyl,5digits/dactyl,moonshadow/dactyl,invl/dactyl,airodactyl/dactyl,Quicksaver/vimperator-labs,nathyong/dactyl,zklinger/vimperator-labs,moonshadow/dactyl,madand/pentadactyl-pm,invl/dactyl,madand/pentadactyl-pm,seanmorton/vimperator-labs,5digits/dactyl,derenio/vimperator-labs,paretje/vimperator-labs,airodactyl/dactyl,Evidlo/vimperator-labs,Evidlo/vimperator-labs,nathyong/dactyl