Format and typo cleanup of 2.3 release notes
Format and typo cleanup of 2.3 release notes

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/rails,arunagw/rails,mechanicles/rails,travisofthenorth/rails,georgeclaghorn/rails,jeremy/rails,tjschuck/rails,eileencodes/rails,Stellenticket/rails,amoody2108/TechForJustice,kmayer/rails,Spin42/rails,kddeisz/rails,mohitnatoo/rails,esparta/rails,mathieujobin/reduced-rails-for-travis,kamipo/rails,voray/rails,maicher/rails,gavingmiller/rails,yahonda/rails,kenta-s/rails,rossta/rails,yawboakye/rails,Vasfed/rails,bogdanvlviv/rails,arjes/rails,notapatch/rails,xlymian/rails,kamipo/rails,hanystudy/rails,yalab/rails,ttanimichi/rails,eileencodes/rails,88rabbit/newRails,deraru/rails,fabianoleittes/rails,aditya-kapoor/rails,rbhitchcock/rails,ngpestelos/rails,mijoharas/rails,richseviora/rails,felipecvo/rails,mtsmfm/rails,utilum/rails,kirs/rails-1,gfvcastro/rails,yasslab/railsguides.jp,amoody2108/TechForJustice,illacceptanything/illacceptanything,amoody2108/TechForJustice,illacceptanything/illacceptanything,rossta/rails,arunagw/rails,BlakeWilliams/rails,coreyward/rails,koic/rails,gcourtemanche/rails,repinel/rails,MSP-Greg/rails,pvalena/rails,yawboakye/rails,Envek/rails,bogdanvlviv/rails,mtsmfm/rails,schuetzm/rails,mijoharas/rails,stefanmb/rails,printercu/rails,yhirano55/rails,untidy-hair/rails,Edouard-chin/rails,utilum/rails