updated OrderedMultiSet comment
updated OrderedMultiSet comment

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