The random.Generator class has a new ``permuted`` function.
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The new function differs from ``shuffle`` and ``permutation`` in that the
subarrays indexed by an axis are permuted rather than the axis being treated as
a separate 1-D array for every combination of the other indexes. For example,
it is now possible to permute the rows or columns of a 2-D array.

Add gh-15121 to NumPy 1.20.0 release notes.
DOC: Add gh-15121 to NumPy 1.20.0 release notes.
