Update posts/2021-03-25-Rust-1.51.0.md

Co-authored-by: Josh Stone <cuviper@gmail.com>

Author: Mark-Simulacrum

posts/2021-03-25-Rust-1.51.0.md

@@ -72,7 +72,7 @@ Const generics adds an important new tool for library designers in creating new,
 
 ### `array::IntoIter` Stabilisation
 
-As part of const generics stabilising, we're also stabilising a new API that uses it, `std::array::IntoIter`. `IntoIter` allows you to create a by value iterator over any array. Previously there wasn't a convenient way to iterate over owned values of an array, only references to them.X
+As part of const generics stabilising, we're also stabilising a new API that uses it, `std::array::IntoIter`. `IntoIter` allows you to create a by value iterator over any array. Previously there wasn't a convenient way to iterate over owned values of an array, only references to them.
 
 ```rust
 fn main() {