make public access buckets section a header that can be linked to

Amazon-S3-API.md

@@ -146,6 +146,7 @@ You can create as many users as needed. Each user can have multiple credentials.
 * The "List:<bucket_name>" action allows listing files within a bucket, e.g., "List:bucket2".
 * The "Tagging:<bucket_name>" action allows tagging files within a bucket, e.g., "Tagging:bucket2".
 
+### Public access (with anonymous download)
 
 For public access, you can configure an identity with name "anonymous", usually with just "Read" action, or access to specific buckets.