docs: Fix typo (closes amannn#1599)

Author: amannn

docs/src/pages/docs/usage/configuration.mdx

@@ -362,7 +362,7 @@ The configured time zone can be read via `useTimeZone` or `getTimeZone` in compo
 ```tsx
 // Regular components
 import {useTimeZone} from 'next-intl';
-const messages = useTimeZone();
+const timeZone = useTimeZone();
 
 // Async Server Components
 import {getTimeZone} from 'next-intl/server';