Fix Sphinx markup so the sample reference is a literal block.
Fix Sphinx markup so the sample reference is a literal block.

[skip azp] [skip actions]

andyfaff/scipy,anntzer/scipy,Stefan-Endres/scipy,rgommers/scipy,anntzer/scipy,mdhaber/scipy,scipy/scipy,perimosocordiae/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,anntzer/scipy,rgommers/scipy,vigna/scipy,vigna/scipy,ilayn/scipy,andyfaff/scipy,perimosocordiae/scipy,rgommers/scipy,ilayn/scipy,WarrenWeckesser/scipy,mdhaber/scipy,Stefan-Endres/scipy,anntzer/scipy,ilayn/scipy,anntzer/scipy,andyfaff/scipy,rgommers/scipy,vigna/scipy,mdhaber/scipy,vigna/scipy,endolith/scipy,Stefan-Endres/scipy,mdhaber/scipy,mdhaber/scipy,scipy/scipy,ilayn/scipy,endolith/scipy,ilayn/scipy,Stefan-Endres/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,scipy/scipy,perimosocordiae/scipy,andyfaff/scipy,scipy/scipy,vigna/scipy,scipy/scipy,WarrenWeckesser/scipy,ilayn/scipy,mdhaber/scipy,scipy/scipy,endolith/scipy,andyfaff/scipy,WarrenWeckesser/scipy,WarrenWeckesser/scipy,endolith/scipy,endolith/scipy,endolith/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,rgommers/scipy,andyfaff/scipy,anntzer/scipy