DOC: add some missing ma functions to reference
DOC: add some missing ma functions to reference

closes gh-4898

ChanderG/numpy,larsmans/numpy,joferkington/numpy,githubmlai/numpy,MaPePeR/numpy,leifdenby/numpy,dch312/numpy,empeeu/numpy,CMartelLML/numpy,ContinuumIO/numpy,SiccarPoint/numpy,grlee77/numpy,moreati/numpy,jakirkham/numpy,AustereCuriosity/numpy,nguyentu1602/numpy,Yusa95/numpy,argriffing/numpy,bmorris3/numpy,rgommers/numpy,mortada/numpy,chatcannon/numpy,ahaldane/numpy,MichaelAquilina/numpy,rmcgibbo/numpy,WarrenWeckesser/numpy,WillieMaddox/numpy,jankoslavic/numpy,BMJHayward/numpy,WarrenWeckesser/numpy,Linkid/numpy,rhythmsosad/numpy,sinhrks/numpy,NextThought/pypy-numpy,mingwpy/numpy,sigma-random/numpy,AustereCuriosity/numpy,ahaldane/numpy,jorisvandenbossche/numpy,anntzer/numpy,mindw/numpy,MichaelAquilina/numpy,bmorris3/numpy,kirillzhuravlev/numpy,skymanaditya1/numpy,jschueller/numpy,tdsmith/numpy,BMJHayward/numpy,musically-ut/numpy,bringingheavendown/numpy,jschueller/numpy,charris/numpy,madphysicist/numpy,MSeifert04/numpy,hainm/numpy,rudimeier/numpy,hainm/numpy,moreati/numpy,bertrand-l/numpy,moreati/numpy,SiccarPoint/numpy,jankoslavic/numpy,rmcgibbo/numpy,cjermain/numpy,naritta/numpy,shoyer/numpy,maniteja123/numpy,mindw/numpy,Anwesh43/numpy,githubmlai/numpy,drasmuss/numpy,ekalosak/numpy,pbrod/numpy,mhvk/numpy,BabeNovelty/numpy,simongibbons/numpy,rudimeier/numpy,tacaswell/numpy,rhythmsosad/numpy,yiakwy/numpy,jorisvandenbossche/numpy,charris/numpy,KaelChen/numpy,BMJHayward/numpy,ESSS/numpy,mortada/numpy,SunghanKim/numpy,rmcgibbo/numpy,dch312/numpy,seberg/numpy,njase/numpy,bertrand-l/numpy,anntzer/numpy,Eric89GXL/numpy,jschueller/numpy,simongibbons/numpy,behzadnouri/numpy,gmcastil/numpy,SiccarPoint/numpy,dato-code/numpy,solarjoe/numpy,kiwifb/numpy,behzadnouri/numpy,anntzer/numpy,dimasad/numpy,ahaldane/numpy,njase/numpy,cjermain/numpy,musically-ut/numpy,sigma-random/numpy,dch312/numpy,grlee77/numpy,ahaldane/numpy,shoyer/numpy,skymanaditya1/numpy,chatcannon/numpy,felipebetancur/numpy,kirillzhuravlev/numpy,andsor/numpy,sonnyhu/numpy,SiccarPoint/numpy,bertrand-l/numpy,Eric89GXL/numpy,ContinuumIO/numpy,GaZ3ll3/numpy,numpy/numpy,gmcastil/numpy,dimasad/numpy,utke1/numpy,githubmlai/numpy,mattip/numpy,skwbc/numpy,Linkid/numpy,ChristopherHogan/numpy,grlee77/numpy,pyparallel/numpy,nbeaver/numpy,maniteja123/numpy,numpy/numpy,drasmuss/numpy,pdebuyl/numpy,sinhrks/numpy,rherault-insa/numpy,rajathkumarmp/numpy,dwillmer/numpy,ddasilva/numpy,kiwifb/numpy,bmorris3/numpy,GrimDerp/numpy,jschueller/numpy,rhythmsosad/numpy,mhvk/numpy,sigma-random/numpy,ekalosak/numpy,SunghanKim/numpy,pdebuyl/numpy,NextThought/pypy-numpy,pdebuyl/numpy,GaZ3ll3/numpy,stuarteberg/numpy,ESSS/numpy,Anwesh43/numpy,dimasad/numpy,tynn/numpy,endolith/numpy,mhvk/numpy,has2k1/numpy,ContinuumIO/numpy,brandon-rhodes/numpy,naritta/numpy,pyparallel/numpy,ahaldane/numpy,stuarteberg/numpy,joferkington/numpy,mingwpy/numpy,sinhrks/numpy,mwiebe/numpy,pizzathief/numpy,rajathkumarmp/numpy,mhvk/numpy,maniteja123/numpy,rmcgibbo/numpy,endolith/numpy,utke1/numpy,MichaelAquilina/numpy,bmorris3/numpy,mwiebe/numpy,jakirkham/numpy,madphysicist/numpy,joferkington/numpy,pbrod/numpy,mingwpy/numpy,pizzathief/numpy,CMartelLML/numpy,Srisai85/numpy,sinhrks/numpy,seberg/numpy,cjermain/numpy,andsor/numpy,KaelChen/numpy,ekalosak/numpy,ddasilva/numpy,shoyer/numpy,pyparallel/numpy,argriffing/numpy,ssanderson/numpy,sonnyhu/numpy,ChristopherHogan/numpy,trankmichael/numpy,seberg/numpy,nguyentu1602/numpy,mathdd/numpy,ESSS/numpy,Linkid/numpy,mingwpy/numpy,jorisvandenbossche/numpy,abalkin/numpy,githubmlai/numpy,BabeNovelty/numpy,larsmans/numpy,ajdawson/numpy,abalkin/numpy,trankmichael/numpy,dwillmer/numpy,shoyer/numpy,pdebuyl/numpy,sigma-random/numpy,NextThought/pypy-numpy,Yusa95/numpy,empeeu/numpy,dwillmer/numpy,yiakwy/numpy,Srisai85/numpy,gfyoung/numpy,CMartelLML/numpy,dato-code/numpy,MSeifert04/numpy,pizzathief/numpy,simongibbons/numpy,mindw/numpy,sonnyhu/numpy,chiffa/numpy,rgommers/numpy,WillieMaddox/numpy,brandon-rhodes/numpy,ChanderG/numpy,charris/numpy,MichaelAquilina/numpy,NextThought/pypy-numpy,chiffa/numpy,gfyoung/numpy,MaPePeR/numpy,brandon-rhodes/numpy,gmcastil/numpy,jonathanunderwood/numpy,chiffa/numpy,groutr/numpy,rgommers/numpy,Srisai85/numpy,Dapid/numpy,empeeu/numpy,andsor/numpy,numpy/numpy,mortada/numpy,ChristopherHogan/numpy,ddasilva/numpy,drasmuss/numpy,ChanderG/numpy,AustereCuriosity/numpy,b-carter/numpy,WarrenWeckesser/numpy,SunghanKim/numpy,MSeifert04/numpy,empeeu/numpy,cowlicks/numpy,Linkid/numpy,mortada/numpy,simongibbons/numpy,Srisai85/numpy,utke1/numpy,groutr/numpy,dch312/numpy,dimasad/numpy,nbeaver/numpy,ajdawson/numpy,mathdd/numpy,tacaswell/numpy,pizzathief/numpy,Yusa95/numpy,rhythmsosad/numpy,anntzer/numpy,musically-ut/numpy,madphysicist/numpy,felipebetancur/numpy,cjermain/numpy,ssanderson/numpy,rudimeier/numpy,abalkin/numpy,rudimeier/numpy,skwbc/numpy,GaZ3ll3/numpy,joferkington/numpy,mattip/numpy,GrimDerp/numpy,bringingheavendown/numpy,rherault-insa/numpy,b-carter/numpy,Dapid/numpy,has2k1/numpy,stuarteberg/numpy,dwillmer/numpy,GrimDerp/numpy,jankoslavic/numpy,ajdawson/numpy,SunghanKim/numpy,hainm/numpy,rajathkumarmp/numpy,b-carter/numpy,MSeifert04/numpy,nguyentu1602/numpy,mathdd/numpy,pbrod/numpy,pbrod/numpy,pizzathief/numpy,andsor/numpy,cowlicks/numpy,Yusa95/numpy,Eric89GXL/numpy,hainm/numpy,GrimDerp/numpy,felipebetancur/numpy,kirillzhuravlev/numpy,numpy/numpy,tdsmith/numpy,jankoslavic/numpy,larsmans/numpy,ekalosak/numpy,naritta/numpy,rajathkumarmp/numpy,skymanaditya1/numpy,brandon-rhodes/numpy,groutr/numpy,trankmichael/numpy,pbrod/numpy,ajdawson/numpy,tynn/numpy,ChanderG/numpy,bringingheavendown/numpy,madphysicist/numpy,GaZ3ll3/numpy,CMartelLML/numpy,nbeaver/numpy,WarrenWeckesser/numpy,WillieMaddox/numpy,gfyoung/numpy,kirillzhuravlev/numpy,chatcannon/numpy,yiakwy/numpy,solarjoe/numpy,jorisvandenbossche/numpy,mattip/numpy,simongibbons/numpy,behzadnouri/numpy,leifdenby/numpy,ViralLeadership/numpy,felipebetancur/numpy,KaelChen/numpy,mindw/numpy,jonathanunderwood/numpy,dato-code/numpy,Anwesh43/numpy,rgommers/numpy,cowlicks/numpy,naritta/numpy,KaelChen/numpy,jonathanunderwood/numpy,ChristopherHogan/numpy,jakirkham/numpy,Dapid/numpy,jorisvandenbossche/numpy,Anwesh43/numpy,madphysicist/numpy,endolith/numpy,mathdd/numpy,endolith/numpy,ViralLeadership/numpy,rherault-insa/numpy,cowlicks/numpy,charris/numpy,larsmans/numpy,mattip/numpy,dato-code/numpy,MSeifert04/numpy,seberg/numpy,BabeNovelty/numpy,argriffing/numpy,leifdenby/numpy,skymanaditya1/numpy,kiwifb/numpy,has2k1/numpy,shoyer/numpy,mwiebe/numpy,BabeNovelty/numpy,mhvk/numpy,BMJHayward/numpy,grlee77/numpy,sonnyhu/numpy,tacaswell/numpy,grlee77/numpy,jakirkham/numpy,musically-ut/numpy,tdsmith/numpy,has2k1/numpy,trankmichael/numpy,jakirkham/numpy,yiakwy/numpy,nguyentu1602/numpy,ViralLeadership/numpy,ssanderson/numpy,tdsmith/numpy,stuarteberg/numpy,skwbc/numpy,Eric89GXL/numpy,njase/numpy,MaPePeR/numpy,WarrenWeckesser/numpy,tynn/numpy,solarjoe/numpy,MaPePeR/numpy