DOC: Record when axis was added to linalg.norm (#10426)
DOC: Record when axis was added to linalg.norm (#10426)

Fixes #5727

The axis argument was introduced in #3387
numpy/numpy,pizzathief/numpy,mhvk/numpy,seberg/numpy,jakirkham/numpy,WarrenWeckesser/numpy,mhvk/numpy,rgommers/numpy,jakirkham/numpy,pizzathief/numpy,simongibbons/numpy,mhvk/numpy,ahaldane/numpy,jorisvandenbossche/numpy,Eric89GXL/numpy,madphysicist/numpy,simongibbons/numpy,shoyer/numpy,jorisvandenbossche/numpy,endolith/numpy,gfyoung/numpy,jorisvandenbossche/numpy,simongibbons/numpy,jorisvandenbossche/numpy,jakirkham/numpy,ahaldane/numpy,shoyer/numpy,charris/numpy,pbrod/numpy,endolith/numpy,ahaldane/numpy,pdebuyl/numpy,pizzathief/numpy,madphysicist/numpy,rgommers/numpy,endolith/numpy,endolith/numpy,jakirkham/numpy,jorisvandenbossche/numpy,gfyoung/numpy,MSeifert04/numpy,anntzer/numpy,grlee77/numpy,anntzer/numpy,grlee77/numpy,grlee77/numpy,anntzer/numpy,MSeifert04/numpy,tynn/numpy,tynn/numpy,anntzer/numpy,mattip/numpy,mattip/numpy,shoyer/numpy,pbrod/numpy,abalkin/numpy,pizzathief/numpy,tynn/numpy,seberg/numpy,ahaldane/numpy,simongibbons/numpy,numpy/numpy,numpy/numpy,mhvk/numpy,WarrenWeckesser/numpy,shoyer/numpy,charris/numpy,pdebuyl/numpy,pbrod/numpy,seberg/numpy,rgommers/numpy,pdebuyl/numpy,Eric89GXL/numpy,pbrod/numpy,abalkin/numpy,charris/numpy,shoyer/numpy,jakirkham/numpy,pdebuyl/numpy,abalkin/numpy,rgommers/numpy,mattip/numpy,mattip/numpy,mhvk/numpy,WarrenWeckesser/numpy,simongibbons/numpy,numpy/numpy,MSeifert04/numpy,pbrod/numpy,charris/numpy,madphysicist/numpy,WarrenWeckesser/numpy,pizzathief/numpy,Eric89GXL/numpy,gfyoung/numpy,madphysicist/numpy,madphysicist/numpy,Eric89GXL/numpy,seberg/numpy,MSeifert04/numpy,grlee77/numpy,WarrenWeckesser/numpy,grlee77/numpy,MSeifert04/numpy,ahaldane/numpy