DOC: Add some missing functions in the list of available ufuncs.
DOC: Add some missing functions in the list of available ufuncs.

See #15214

pdebuyl/numpy,WarrenWeckesser/numpy,charris/numpy,endolith/numpy,simongibbons/numpy,abalkin/numpy,rgommers/numpy,pdebuyl/numpy,charris/numpy,anntzer/numpy,jakirkham/numpy,WarrenWeckesser/numpy,WarrenWeckesser/numpy,WarrenWeckesser/numpy,numpy/numpy,endolith/numpy,madphysicist/numpy,pdebuyl/numpy,pbrod/numpy,simongibbons/numpy,simongibbons/numpy,mhvk/numpy,jakirkham/numpy,endolith/numpy,mhvk/numpy,madphysicist/numpy,anntzer/numpy,WarrenWeckesser/numpy,mhvk/numpy,seberg/numpy,numpy/numpy,pbrod/numpy,mattip/numpy,pbrod/numpy,grlee77/numpy,grlee77/numpy,jakirkham/numpy,abalkin/numpy,mhvk/numpy,seberg/numpy,mhvk/numpy,pdebuyl/numpy,simongibbons/numpy,mattip/numpy,madphysicist/numpy,rgommers/numpy,jakirkham/numpy,grlee77/numpy,grlee77/numpy,endolith/numpy,seberg/numpy,charris/numpy,grlee77/numpy,anntzer/numpy,abalkin/numpy,numpy/numpy,madphysicist/numpy,rgommers/numpy,seberg/numpy,simongibbons/numpy,numpy/numpy,mattip/numpy,pbrod/numpy,mattip/numpy,anntzer/numpy,jakirkham/numpy,charris/numpy,pbrod/numpy,rgommers/numpy,madphysicist/numpy