Fix typo in dataset_filtering.rdoc
Fix typo in dataset_filtering.rdoc

knut2/sequel,reubano/sequel,uhoh-itsmaciek/sequel,nju520/sequel,t-morgan/sequel,mpalmer/sequel,tmm1/sequel,davidbegin/sequel,t-morgan/sequel,nicohvi/sequel,pfarrell/sequel,reubano/sequel,bigfix/sequel,offshore-safety/sequel,offshore-safety/sequel,chef/sequel,yazshel/sequel,nicohvi/sequel,freshpay/sequel,dennis-d/custom_sequel,dennis-d/custom_sequel,uhoh-itsmaciek/sequel,nju520/sequel,gferguson-gd/sequel,offshore-safety/sequel,freshpay/sequel,davidbegin/sequel,mpalmer/sequel,yazshel/sequel,beni55/sequel,seeARMS/sequel,petergunz/sequel,knut2/sequel,seeARMS/sequel,gferguson-gd/sequel,pfarrell/sequel,beni55/sequel,Marketcircle/sequel