message: Fix documentation warning
diff: @@ -54,8 +54,6 @@ public:
  // -- communication to downstream actors -------------------------------------
  /// Tries sending batches to downstream actors.
  - /// @param hint Optionally passes the last result of `total_credit` to
  - /// avoid recalculation.
  virtual void emit_batches() = 0;
  // -- feedback to upstream policy --------------------------------------------
  