DOC: fix typo in `numpy._typing._NestedSequence` docstring example (#21909)
DOC: fix typo in `numpy._typing._NestedSequence` docstring example (#21909)

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numpy/numpy,anntzer/numpy,charris/numpy,endolith/numpy,endolith/numpy,rgommers/numpy,charris/numpy,rgommers/numpy,mhvk/numpy,endolith/numpy,mhvk/numpy,mattip/numpy,numpy/numpy,mattip/numpy,mhvk/numpy,endolith/numpy,anntzer/numpy,mhvk/numpy,numpy/numpy,mhvk/numpy,numpy/numpy,rgommers/numpy,charris/numpy,anntzer/numpy,anntzer/numpy,mattip/numpy,rgommers/numpy,charris/numpy,mattip/numpy