DOC: add example for `stats.mstats.compare_median_ms` (#14068)
DOC: add example for `stats.mstats.compare_median_ms` (#14068)

* Added example for compare_median_ms

Co-authored-by: Matt Haberland <1f6e3f9dd4f3b851e1c9f994a33220fb712394f1@calpoly.edu>
scipy/scipy,rgommers/scipy,perimosocordiae/scipy,Stefan-Endres/scipy,andyfaff/scipy,rgommers/scipy,scipy/scipy,WarrenWeckesser/scipy,endolith/scipy,mdhaber/scipy,endolith/scipy,Stefan-Endres/scipy,endolith/scipy,vigna/scipy,anntzer/scipy,WarrenWeckesser/scipy,scipy/scipy,ilayn/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,rgommers/scipy,mdhaber/scipy,vigna/scipy,mdhaber/scipy,anntzer/scipy,andyfaff/scipy,ilayn/scipy,WarrenWeckesser/scipy,endolith/scipy,endolith/scipy,perimosocordiae/scipy,vigna/scipy,ilayn/scipy,ilayn/scipy,Stefan-Endres/scipy,andyfaff/scipy,perimosocordiae/scipy,mdhaber/scipy,anntzer/scipy,ilayn/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,andyfaff/scipy,rgommers/scipy,mdhaber/scipy,scipy/scipy,anntzer/scipy,endolith/scipy,scipy/scipy,anntzer/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,ilayn/scipy,rgommers/scipy,andyfaff/scipy,andyfaff/scipy,mdhaber/scipy,perimosocordiae/scipy,anntzer/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,vigna/scipy,scipy/scipy,vigna/scipy