fix build error

app/[lang]/[...slug]/page.tsx

@@ -13,4 +13,4 @@ export default async function DocPage({ params }: { params: { lang: string; slug
   )
 
   return <Page />
-}
+}

lib/mdx.ts

@@ -7,4 +7,4 @@ export function getMdxPath(lang: string, slug: string[]) {
 
 export function mdxExists(mdxPath: string) {
   return fs.existsSync(mdxPath)
-}
+}

next.config.mjs

@@ -11,4 +11,4 @@ export default withMDX({
     config.resolve.alias['@'] = path.resolve(__dirname)
     return config
   },
-})
+})