DOC: Corrected numpy.power example.
DOC: Corrected numpy.power example.

See #18256

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