Bug 20646 – [Module std.container.rbtree] inadequate documentation

Every one of the examples shown at the top of the page uses the redBlackTree function which takes a sequence of items. There isn't a single example that begins with an empty tree or that uses new. Yet, because RedBlackTree is a class, you _must_ use new to create a new empty tree. I think there should be at least one example showing how to create an empty tree, and then populate it with some values.

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