DOC: Fix dev doc link
DOC: Fix dev doc link

[ci skip]
pllim/astropy,saimn/astropy,larrybradley/astropy,mhvk/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,saimn/astropy,saimn/astropy,larrybradley/astropy,astropy/astropy,pllim/astropy,lpsinger/astropy,lpsinger/astropy,saimn/astropy,StuartLittlefair/astropy,mhvk/astropy,astropy/astropy,pllim/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,astropy/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,mhvk/astropy,pllim/astropy,StuartLittlefair/astropy,mhvk/astropy,saimn/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,lpsinger/astropy,larrybradley/astropy,astropy/astropy,pllim/astropy,astropy/astropy,mhvk/astropy,larrybradley/astropy,StuartLittlefair/astropy