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rust/src
Alex Crichton 42dbee098b rollup merge of #19930: cllns/lowercase-if
On the [guide site](http://doc.rust-lang.org/guide.html#if) I was confused when I got to "5 If". It looked like "5 LF" in lowercase.

Changing the if to lowercase solves this problem. I know titles are all capitalized, but I think it makes sense in this case to keep it lowercase, since `if` is a reserved word. I'd also be open to making it ```    `if`   ``` but I'm not sure how that would look on the site.

Before:
![screen shot 2014-12-16 at 12 58 01](https://cloud.githubusercontent.com/assets/632942/5458866/cb34c006-8523-11e4-89ef-3a3964bcedfc.png)
After:
![screen shot 2014-12-16 at 12 58 14](https://cloud.githubusercontent.com/assets/632942/5458865/cb33c444-8523-11e4-8d95-d377ed583ed6.png)
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