Fix typo in actionpack changelog, `a HTTP` -> `an HTTP` [ci skip]
Fix typo in actionpack changelog, `a HTTP` -> `an HTTP` [ci skip]

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