message: Clarify that in_nodes and in_edges includes control edges.
diff: @@ -124,7 +124,8 @@ class Node {
  // Inputs requested by the NodeDef. For the actual inputs, use in_edges.
  const protobuf::RepeatedPtrField<string>& requested_inputs() const;
  - // Get the neighboring nodes via edges either in or out of this node.
  + // Get the neighboring nodes via edges either in or out of this node. This
  + // includes control edges.
  gtl::iterator_range<NeighborIter> in_nodes() const;
  gtl::iterator_range<NeighborIter> out_nodes() const;
  const EdgeSet& in_edges() const { return in_edges_; }
  