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759820e631
Fix predicate signatures in retain_mut docs This is my first PR here so let me know if I'm doing anything wrong. The docs for `retain_mut` in `LinkedList` and `VecDeque` say the predicate takes `&e`, but it should be `&mut e` to match the actual signature. `Vec` [has it documented](https://doc.rust-lang.org/std/vec/struct.Vec.html#method.retain_mut) correctly already.