typo

src/borrowing/interior-mutability.md

@@ -50,7 +50,7 @@ fn main() {
 ## `Cell`
 
 `Cell` wraps a value and allows getting or setting the value, even with a shared
-reference to the `Cell`. Howerver, it does not allow any references to the
+reference to the `Cell`. However, it does not allow any references to the
 value. Since there are no references, borrowing rules cannot be broken.
 
 <details>