updated temperature conversion in the equivalencies doc
updated temperature conversion in the equivalencies doc

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