Fix typo from `naively` to `naïvely`

src/hrtb.md

@@ -25,7 +25,7 @@ fn main() {
 }
 ```
 
-If we try to naively desugar this code in the same way that we did in the
+If we try to naïvely desugar this code in the same way that we did in the
 lifetimes section, we run into some trouble:
 
 ```rust,ignore

src/repr-rust.md

@@ -113,7 +113,7 @@ requires different monomorphizations to have *different field orderings*.
 **Note: this is a hypothetical optimization that is not yet implemented in Rust
 1.0**
 
-Enums make this consideration even more complicated. Naively, an enum such as:
+Enums make this consideration even more complicated. Naïvely, an enum such as:
 
 ```rust
 enum Foo {

src/vec-layout.md

@@ -4,7 +4,7 @@ First off, we need to come up with the struct layout. A Vec has three parts:
 a pointer to the allocation, the size of the allocation, and the number of
 elements that have been initialized.
 
-Naively, this means we just want this design:
+Naïvely, this means we just want this design:
 
 ```rust
 pub struct Vec<T> {