message: Add comment describing fusion_config_ and dot_config_ in HloModuleConfig.
diff: @@ -219,8 +219,13 @@ class HloModuleConfig {
  FusionConfigCollection fusion_config_collection_ =
  FusionConfigCollection::kOff;
  + // Custom fusion configuration, where fusion_config_[c][v] control if node v
  + // in computation c must be fused to all its consumers (true) or not (false).
  std::vector<std::vector<bool>> fusion_config_;
  + // Custom dot canonicalization configuration, where dot_config_[v] control
  + // how to convert dot operation v (sorted topologically and by computation) to
  + // convolution.
  std::vector<std::vector<int64>> dot_config_;
  };
  