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

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