Added multiple database Active Record guide entry to the release notes [ci skip]
Added multiple database Active Record guide entry to the release notes [ci skip]

tjschuck/rails,betesh/rails,yalab/rails,tjschuck/rails,iainbeeston/rails,starknx/rails,gauravtiwari/rails,repinel/rails,Vasfed/rails,starknx/rails,Edouard-chin/rails,mechanicles/rails,fabianoleittes/rails,Edouard-chin/rails,kddeisz/rails,iainbeeston/rails,arunagw/rails,palkan/rails,eileencodes/rails,esparta/rails,MSP-Greg/rails,kmcphillips/rails,eileencodes/rails,Envek/rails,rails/rails,betesh/rails,yawboakye/rails,vipulnsward/rails,Stellenticket/rails,yhirano55/rails,tgxworld/rails,arunagw/rails,Erol/rails,schuetzm/rails,rails/rails,repinel/rails,esparta/rails,schuetzm/rails,kmcphillips/rails,fabianoleittes/rails,prathamesh-sonpatki/rails,shioyama/rails,georgeclaghorn/rails,Edouard-chin/rails,jeremy/rails,lcreid/rails,tgxworld/rails,kddeisz/rails,rafaelfranca/omg-rails,EmmaB/rails-1,eileencodes/rails,MSP-Greg/rails,starknx/rails,tgxworld/rails,notapatch/rails,yalab/rails,fabianoleittes/rails,repinel/rails,betesh/rails,schuetzm/rails,EmmaB/rails-1,Edouard-chin/rails,rails/rails,yhirano55/rails,joonyou/rails,tjschuck/rails,Envek/rails,vipulnsward/rails,rails/rails,rafaelfranca/omg-rails,esparta/rails,gauravtiwari/rails,palkan/rails,Stellenticket/rails,iainbeeston/rails,kddeisz/rails,joonyou/rails,shioyama/rails,palkan/rails,BlakeWilliams/rails,jeremy/rails,Erol/rails,yawboakye/rails,rafaelfranca/omg-rails,vipulnsward/rails,Envek/rails,MSP-Greg/rails,kmcphillips/rails,prathamesh-sonpatki/rails,notapatch/rails,lcreid/rails,eileencodes/rails,tgxworld/rails,arunagw/rails,yhirano55/rails,yalab/rails,joonyou/rails,lcreid/rails,yawboakye/rails,kmcphillips/rails,EmmaB/rails-1,bogdanvlviv/rails,bogdanvlviv/rails,jeremy/rails,shioyama/rails,bogdanvlviv/rails,BlakeWilliams/rails,yahonda/rails,jeremy/rails,shioyama/rails,betesh/rails,fabianoleittes/rails,BlakeWilliams/rails,lcreid/rails,georgeclaghorn/rails,yawboakye/rails,mechanicles/rails,georgeclaghorn/rails,Stellenticket/rails,MSP-Greg/rails,notapatch/rails,gauravtiwari/rails,Vasfed/rails,Stellenticket/rails,tjschuck/rails,esparta/rails,bogdanvlviv/rails,Erol/rails,kddeisz/rails,iainbeeston/rails,Vasfed/rails,Erol/rails,arunagw/rails,yalab/rails,schuetzm/rails,yhirano55/rails,joonyou/rails,Envek/rails,prathamesh-sonpatki/rails,yahonda/rails,yahonda/rails,vipulnsward/rails,mechanicles/rails,georgeclaghorn/rails,repinel/rails,yahonda/rails,palkan/rails,notapatch/rails,prathamesh-sonpatki/rails,BlakeWilliams/rails,Vasfed/rails,mechanicles/rails