Fix minor typo
Fix minor typo

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