Add all of the join methods to the dataset basics guide
Add all of the join methods to the dataset basics guide

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