DOC: Improve trapz docstring (#19041)
DOC: Improve trapz docstring (#19041)

Co-authored-by: Eric Wieser <da64e90baec5d084ce3d8e05f3b022ae6d118ff5@gmail.com>
jakirkham/numpy,jakirkham/numpy,endolith/numpy,simongibbons/numpy,seberg/numpy,anntzer/numpy,mattip/numpy,numpy/numpy,charris/numpy,endolith/numpy,anntzer/numpy,endolith/numpy,mattip/numpy,charris/numpy,simongibbons/numpy,numpy/numpy,pdebuyl/numpy,mhvk/numpy,jakirkham/numpy,simongibbons/numpy,pdebuyl/numpy,rgommers/numpy,mhvk/numpy,simongibbons/numpy,rgommers/numpy,seberg/numpy,endolith/numpy,rgommers/numpy,pdebuyl/numpy,mhvk/numpy,charris/numpy,jakirkham/numpy,mattip/numpy,mhvk/numpy,seberg/numpy,mattip/numpy,rgommers/numpy,anntzer/numpy,numpy/numpy,pdebuyl/numpy,mhvk/numpy,charris/numpy,numpy/numpy,jakirkham/numpy,anntzer/numpy,seberg/numpy,simongibbons/numpy