Fix some grammar issues in association basics guide (Fixes #867)
Fix some grammar issues in association basics guide (Fixes #867)

This is a squashed commit from gferguson-gd.

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