Use width_heuristics in the options docs

It was using an older name
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Nick Cameron 2018-10-23 14:59:14 +13:00 committed by GitHub
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@ -271,7 +271,7 @@ fn lorem<Ipsum, Dolor, Sit, Amet>() -> T
}
```
## `use_small_heuristics`
## `width_heuristics`
Whether to use different formatting for items and expressions if they satisfy a heuristic notion of 'small'.