Documentation changes [ci skip]
Documentation changes [ci skip]

* Add note on new idiom for migration methods
* Mostly, correct punctuation and spelling
* Standardize capitalizations/upcase e.g., mime to MIME, paperclip to Paperclip

victorngkp/paperclip,tiegz/paperclip,betesh/paperclip,raow/paperclip,greatbody/paperclip,aditya01933/paperclip,raow/paperclip,alexandrz/paperclip,zurb/paperclip,bdewater/paperclip,justanshulsharma/paperclip,ScotterC/paperclip,sopheak-se/paperclip,mdkalish/paperclip,tylerwillingham/paperclip,tylerwillingham/paperclip,gfvcastro/paperclip,aditya01933/paperclip,joshisa/paperclip,InesCARodrigues/paperclip,mdkalish/paperclip,mrgilman/paperclip,Cohealo/paperclip,soramugi/paperclip,keathley/paperclip,manorie/paperclip,frankpinto/paperclip,rpbaptist/paperclip,onursarikaya/paperclip,tiegz/paperclip,mrb/paperclip,gfvcastro/paperclip,keathley/paperclip,dgynn/paperclip,soramugi/paperclip,mrb/paperclip,mrgilman/paperclip,greatbody/paperclip,freeslugs/paperclip,manorie/paperclip,cmaion/paperclip,joshisa/paperclip,rpbaptist/paperclip,justanshulsharma/paperclip,pandamako/paperclip,InesCARodrigues/paperclip,frankpinto/paperclip,zurb/paperclip,victorngkp/paperclip,ScotterC/paperclip,alexandrz/paperclip,pandamako/paperclip,cmaion/paperclip,freeslugs/paperclip,Cohealo/paperclip,betesh/paperclip,dgynn/paperclip,onursarikaya/paperclip,bdewater/paperclip,sopheak-se/paperclip