DOC: Clarify return type for default rng
DOC: Clarify return type for default rng

Ensure that default_rng has a return type to improve code completion

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