copy edit io/fits/appendix/header_transition
copy edit io/fits/appendix/header_transition

aleksandr-bakanov/astropy,saimn/astropy,lpsinger/astropy,MSeifert04/astropy,stargaser/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,pllim/astropy,mhvk/astropy,lpsinger/astropy,dhomeier/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,astropy/astropy,pllim/astropy,StuartLittlefair/astropy,dhomeier/astropy,pllim/astropy,pllim/astropy,dhomeier/astropy,astropy/astropy,aleksandr-bakanov/astropy,MSeifert04/astropy,mhvk/astropy,dhomeier/astropy,stargaser/astropy,MSeifert04/astropy,larrybradley/astropy,saimn/astropy,astropy/astropy,larrybradley/astropy,pllim/astropy,stargaser/astropy,StuartLittlefair/astropy,lpsinger/astropy,saimn/astropy,larrybradley/astropy,MSeifert04/astropy,larrybradley/astropy,stargaser/astropy,saimn/astropy,dhomeier/astropy,astropy/astropy,lpsinger/astropy,saimn/astropy,astropy/astropy,mhvk/astropy,larrybradley/astropy,mhvk/astropy,mhvk/astropy