fix misleading section on associations guide
fix misleading section on associations guide

BlakeWilliams/rails,Stellenticket/rails,schuetzm/rails,tjschuck/rails,Envek/rails,tgxworld/rails,lcreid/rails,repinel/rails,georgeclaghorn/rails,tjschuck/rails,kddeisz/rails,betesh/rails,lcreid/rails,vipulnsward/rails,BlakeWilliams/rails,MSP-Greg/rails,joonyou/rails,yawboakye/rails,rails/rails,tgxworld/rails,joonyou/rails,eileencodes/rails,Stellenticket/rails,Edouard-chin/rails,vipulnsward/rails,rails/rails,starknx/rails,lcreid/rails,yawboakye/rails,kmcphillips/rails,Vasfed/rails,BlakeWilliams/rails,EmmaB/rails-1,Edouard-chin/rails,esparta/rails,Vasfed/rails,repinel/rails,schuetzm/rails,yalab/rails,betesh/rails,bogdanvlviv/rails,EmmaB/rails-1,repinel/rails,Erol/rails,MSP-Greg/rails,bogdanvlviv/rails,tjschuck/rails,lcreid/rails,tgxworld/rails,georgeclaghorn/rails,tjschuck/rails,tgxworld/rails,rafaelfranca/omg-rails,yalab/rails,schuetzm/rails,esparta/rails,joonyou/rails,starknx/rails,Envek/rails,georgeclaghorn/rails,kmcphillips/rails,yahonda/rails,BlakeWilliams/rails,Envek/rails,Erol/rails,yawboakye/rails,kddeisz/rails,EmmaB/rails-1,MSP-Greg/rails,vipulnsward/rails,esparta/rails,yahonda/rails,georgeclaghorn/rails,kmcphillips/rails,bogdanvlviv/rails,betesh/rails,Edouard-chin/rails,yalab/rails,esparta/rails,Stellenticket/rails,repinel/rails,MSP-Greg/rails,yalab/rails,Vasfed/rails,kddeisz/rails,Edouard-chin/rails,Vasfed/rails,yawboakye/rails,eileencodes/rails,schuetzm/rails,joonyou/rails,rails/rails,starknx/rails,rafaelfranca/omg-rails,Erol/rails,eileencodes/rails,yahonda/rails,kmcphillips/rails,rafaelfranca/omg-rails,vipulnsward/rails,Stellenticket/rails,betesh/rails,rails/rails,Envek/rails,eileencodes/rails,yahonda/rails,Erol/rails,bogdanvlviv/rails,kddeisz/rails