From docs of scatter_add_() removed erroneous comment on uniqueness of indices. (#27132)
Summary:
Fixes https://github.com/pytorch/pytorch/issues/27080
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27132
Differential Revision: D17765307
Pulled By: soumith
fbshipit-source-id: b0892ff442f3b49f8e3cdf029e2a08b51fa88f28
