chore: fix typo (#6791)

`Changlog` -> `Changelog`

src/content/blog/2024/04/25/react-19-upgrade-guide.md

@@ -630,7 +630,7 @@ This is also what you'd also have to do if you move the reducer outside of the `
 const reducer = (state: State, action: Action) => state;
 ```
 
-## Changlog {/*changelog*/}
+## Changelog {/*changelog*/}
 
 ### Other breaking changes {/*other-breaking-changes*/}