bors 8d8a88f4a5 Auto merge of #34335 - ollie27:docs_collections_mods, r=GuillaumeGomez
Add short summaries to btree modules

Also improve hash_map and hash_set module short summaries.

These are missing from [here](https://doc.rust-lang.org/nightly/std/collections/#modules).

r? @steveklabnik
2016-06-19 12:56:13 -07:00
..
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