fix: clarify Pexels configuration behavior

Author: warengonzaga

.env.example

@@ -13,5 +13,5 @@ REDIS_URL=
 
 # Pexels Integration (optional - enables the in-UI image search widget)
 # Get a free API key at https://www.pexels.com/api/
-# When unset, the /api/pexels/search endpoint returns 503 and the search is hidden
+# When unset, the /api/pexels/search endpoint returns 503
 PEXELS_API_KEY=