message: Remove obsolete TODO message.
diff: @@ -75,8 +75,6 @@ class NcclAllReduceThunk : public Thunk {
  // clear how you *could* use it for anything other than tests.)
  static absl::flat_hash_set<GlobalDeviceId> DevicesWithOpenNcclChannels();
  - // TODO(b/125951860): Support all-reduces with replica groups, i.e.
  - // all-reduces that compute multiple sums across subsets of all replicas.
  struct Buffer {
  int64 element_count;
  BufferAllocation::Slice source_buffer;
  