DOC: Fix broken pytest link [ci skip]
DOC: Fix broken pytest link [ci skip]

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