message: Fix the documentation of unique_indices in EmitScatter.
diff: @@ -404,11 +404,10 @@ class IrEmitterUnnested : public IrEmitter,
  // the process. `scatter` may be fused, scatter indices are taken from
  // `scatter_indices_gen`, updates from`updates_gen`. The output buffer is
  // expected to have the operand values in it already. If unique_indices
  - // is false, we will use an atomic update. Using false for unique_indices
  - // is safe only when it is guaranteed that there are no duplicate
  - // indices.
  - // When using unique_indices=true, it is the caller's responsibility to
  - // ensure there is no overlap.
  + // is false, we will use an atomic update. Using true for unique_indices
  + // behaves properly only when it is guaranteed that the indices to be
  + // updated do not overlap. The caller is responsible for ensuring this is
  + // the case.
  Status EmitScatter(Thunk* thunk, HloInstruction* scatter,
  const llvm_ir::ElementGenerator& scatter_indices_gen,
  const llvm_ir::ElementGenerator& updates_gen);
  