Merge pull request rust-lang#1288 from ohno418/fix-typo-in-hrtb

Fix a minor typo in the "Higher-ranked trait bounds" section

Author: ehuss

src/trait-bounds.md

@@ -121,7 +121,7 @@ For example, if `'a` is an unconstrained lifetime parameter, then `i32: 'static`
 > _ForLifetimes_ :\
 >    `for` [_GenericParams_]
 
-Type bounds may be *higher ranked* over lifetimes. These bounds specify a bound
+Trait bounds may be *higher ranked* over lifetimes. These bounds specify a bound
 that is true *for all* lifetimes. For example, a bound such as `for<'a> &'a T:
 PartialEq<i32>` would require an implementation like