dataset/query.rb : Fix an error in filter documentation
dataset/query.rb : Fix an error in filter documentation

There was an error in filter documentation example : (1,2,3) was used instead of [1,2,3]
freshpay/sequel,gferguson-gd/sequel,dennis-d/custom_sequel,nju520/sequel,offshore-safety/sequel,mpalmer/sequel,beni55/sequel,davidbegin/sequel,seeARMS/sequel,uhoh-itsmaciek/sequel,offshore-safety/sequel,reubano/sequel,beni55/sequel,knut2/sequel,freshpay/sequel,offshore-safety/sequel,yazshel/sequel,yazshel/sequel,davidbegin/sequel,uhoh-itsmaciek/sequel,Marketcircle/sequel,dennis-d/custom_sequel,pfarrell/sequel,gferguson-gd/sequel,nicohvi/sequel,bigfix/sequel,nicohvi/sequel,seeARMS/sequel,nju520/sequel,t-morgan/sequel,knut2/sequel,pfarrell/sequel,t-morgan/sequel,reubano/sequel,chef/sequel,mpalmer/sequel