unique keys for RestRepoBanner links (#23764)

Author: Peter Bengtsson

components/page-header/RestRepoBanner.tsx

@@ -1,3 +1,4 @@
+import React from 'react'
 import { Flash } from '@primer/components'
 import { useRouter } from 'next/router'
 import { Link } from 'components/Link'
@@ -35,12 +36,12 @@ export const RestRepoBanner = () => {
     keyof typeof restRepoCategoryExceptionsTitles
   >
   const newRestPagesText = pages.map((page, i) => [
-    <>
+    <React.Fragment key={page}>
       <Link href={`/${router.locale}/rest/reference/${page}`}>
         {restRepoCategoryExceptionsTitles[page]}
       </Link>
       {i < pages.length - 1 && ', '}
-    </>,
+    </React.Fragment>,
   ])
 
   return (