DOC: update docs on building with Meson (#16638)
DOC: update docs on building with Meson (#16638)

[skip azp] [skip github]
rgommers/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,ilayn/scipy,rgommers/scipy,endolith/scipy,perimosocordiae/scipy,rgommers/scipy,andyfaff/scipy,perimosocordiae/scipy,mdhaber/scipy,mdhaber/scipy,ilayn/scipy,anntzer/scipy,rgommers/scipy,andyfaff/scipy,scipy/scipy,endolith/scipy,endolith/scipy,perimosocordiae/scipy,ilayn/scipy,endolith/scipy,perimosocordiae/scipy,andyfaff/scipy,andyfaff/scipy,WarrenWeckesser/scipy,Stefan-Endres/scipy,WarrenWeckesser/scipy,rgommers/scipy,ilayn/scipy,Stefan-Endres/scipy,anntzer/scipy,scipy/scipy,endolith/scipy,mdhaber/scipy,scipy/scipy,andyfaff/scipy,mdhaber/scipy,perimosocordiae/scipy,Stefan-Endres/scipy,anntzer/scipy,anntzer/scipy,perimosocordiae/scipy,Stefan-Endres/scipy,ilayn/scipy,andyfaff/scipy,scipy/scipy,anntzer/scipy,mdhaber/scipy,Stefan-Endres/scipy,scipy/scipy,WarrenWeckesser/scipy,endolith/scipy,WarrenWeckesser/scipy,mdhaber/scipy,scipy/scipy,ilayn/scipy,anntzer/scipy,WarrenWeckesser/scipy