DOC: special: add to docstrings of Kelvin zeros functions (#11196)
DOC: special: add to docstrings of Kelvin zeros functions (#11196)

In particular, add:

- Parameters/returns sections
- See also sections
Stefan-Endres/scipy,anntzer/scipy,scipy/scipy,vigna/scipy,tylerjereddy/scipy,perimosocordiae/scipy,andyfaff/scipy,ilayn/scipy,endolith/scipy,e-q/scipy,perimosocordiae/scipy,mdhaber/scipy,person142/scipy,rgommers/scipy,zerothi/scipy,matthew-brett/scipy,aeklant/scipy,aeklant/scipy,rgommers/scipy,Stefan-Endres/scipy,zerothi/scipy,scipy/scipy,person142/scipy,andyfaff/scipy,perimosocordiae/scipy,pizzathief/scipy,Eric89GXL/scipy,matthew-brett/scipy,mdhaber/scipy,ilayn/scipy,Eric89GXL/scipy,endolith/scipy,aeklant/scipy,person142/scipy,vigna/scipy,tylerjereddy/scipy,vigna/scipy,nmayorov/scipy,grlee77/scipy,pizzathief/scipy,WarrenWeckesser/scipy,grlee77/scipy,WarrenWeckesser/scipy,rgommers/scipy,pizzathief/scipy,WarrenWeckesser/scipy,anntzer/scipy,Stefan-Endres/scipy,ilayn/scipy,Stefan-Endres/scipy,mdhaber/scipy,WarrenWeckesser/scipy,mdhaber/scipy,WarrenWeckesser/scipy,arokem/scipy,Eric89GXL/scipy,anntzer/scipy,Stefan-Endres/scipy,Eric89GXL/scipy,ilayn/scipy,tylerjereddy/scipy,tylerjereddy/scipy,andyfaff/scipy,zerothi/scipy,e-q/scipy,rgommers/scipy,aeklant/scipy,grlee77/scipy,anntzer/scipy,arokem/scipy,rgommers/scipy,scipy/scipy,person142/scipy,scipy/scipy,perimosocordiae/scipy,andyfaff/scipy,anntzer/scipy,vigna/scipy,nmayorov/scipy,e-q/scipy,Eric89GXL/scipy,matthew-brett/scipy,person142/scipy,zerothi/scipy,vigna/scipy,endolith/scipy,nmayorov/scipy,endolith/scipy,perimosocordiae/scipy,scipy/scipy,grlee77/scipy,andyfaff/scipy,ilayn/scipy,nmayorov/scipy,Eric89GXL/scipy,arokem/scipy,endolith/scipy,WarrenWeckesser/scipy,grlee77/scipy,pizzathief/scipy,pizzathief/scipy,anntzer/scipy,mdhaber/scipy,nmayorov/scipy,Stefan-Endres/scipy,tylerjereddy/scipy,arokem/scipy,e-q/scipy,ilayn/scipy,zerothi/scipy,scipy/scipy,aeklant/scipy,zerothi/scipy,mdhaber/scipy,andyfaff/scipy,arokem/scipy,endolith/scipy,perimosocordiae/scipy,matthew-brett/scipy,matthew-brett/scipy,e-q/scipy