development: updated description of Tree RBNode
development: updated description of Tree RBNode

GraphKit/GraphKit-swift,adamdahan/GraphKit,CosmicMind/Graph,CosmicMind/GraphKit,GraphKit/swift,GraphKit/GraphKit,GraphKit/GraphKit-swift,GraphKit/GraphKit,adamdahan/GraphKit,CosmicMind/Graph,GraphKit/swift,CosmicMind/GraphKit