DOC: update np.around docstring with note about floating-point error
DOC: update np.around docstring with note about floating-point error

Fixes #14391

[ci-skip]

endolith/numpy,endolith/numpy,rgommers/numpy,WarrenWeckesser/numpy,simongibbons/numpy,madphysicist/numpy,pbrod/numpy,WarrenWeckesser/numpy,mhvk/numpy,pizzathief/numpy,seberg/numpy,seberg/numpy,numpy/numpy,mattip/numpy,WarrenWeckesser/numpy,grlee77/numpy,endolith/numpy,rgommers/numpy,madphysicist/numpy,pbrod/numpy,madphysicist/numpy,madphysicist/numpy,jorisvandenbossche/numpy,anntzer/numpy,mattip/numpy,jorisvandenbossche/numpy,WarrenWeckesser/numpy,simongibbons/numpy,MSeifert04/numpy,grlee77/numpy,pizzathief/numpy,numpy/numpy,pdebuyl/numpy,abalkin/numpy,WarrenWeckesser/numpy,mattip/numpy,endolith/numpy,rgommers/numpy,simongibbons/numpy,numpy/numpy,MSeifert04/numpy,pizzathief/numpy,jakirkham/numpy,charris/numpy,pdebuyl/numpy,simongibbons/numpy,charris/numpy,madphysicist/numpy,abalkin/numpy,pizzathief/numpy,charris/numpy,MSeifert04/numpy,abalkin/numpy,mhvk/numpy,simongibbons/numpy,pbrod/numpy,rgommers/numpy,seberg/numpy,anntzer/numpy,jakirkham/numpy,grlee77/numpy,grlee77/numpy,mhvk/numpy,grlee77/numpy,mhvk/numpy,pbrod/numpy,jorisvandenbossche/numpy,jakirkham/numpy,numpy/numpy,jorisvandenbossche/numpy,pbrod/numpy,pizzathief/numpy,charris/numpy,pdebuyl/numpy,pdebuyl/numpy,jakirkham/numpy,MSeifert04/numpy,seberg/numpy,jakirkham/numpy,anntzer/numpy,anntzer/numpy,mattip/numpy,mhvk/numpy,MSeifert04/numpy,jorisvandenbossche/numpy