Rollup merge of #55711 - kngwyu:btreemap-rangemut-doc, r=Mark-Simulacrum

Format BtreeMap::range_mut example

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![image](https://user-images.githubusercontent.com/16046705/48049184-36517780-e1e1-11e8-8da2-a3ae858d5a76.png)
After:
![image](https://user-images.githubusercontent.com/16046705/48049210-45382a00-e1e1-11e8-87b3-84ae60ef798e.png)
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kennytm 2018-11-13 13:03:04 +08:00
commit e9bd1f21ec
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@ -853,9 +853,10 @@ impl<K: Ord, V> BTreeMap<K, V> {
/// ``` /// ```
/// use std::collections::BTreeMap; /// use std::collections::BTreeMap;
/// ///
/// let mut map: BTreeMap<&str, i32> = ["Alice", "Bob", "Carol", "Cheryl"].iter() /// let mut map: BTreeMap<&str, i32> = ["Alice", "Bob", "Carol", "Cheryl"]
/// .map(|&s| (s, 0)) /// .iter()
/// .collect(); /// .map(|&s| (s, 0))
/// .collect();
/// for (_, balance) in map.range_mut("B".."Cheryl") { /// for (_, balance) in map.range_mut("B".."Cheryl") {
/// *balance += 100; /// *balance += 100;
/// } /// }