broken links on SG config reference page

Check all .adoc references on this page, they are broken. E.g., "config-properties.adoc#databases-foo_db-delta_sync" link should point to https://docs.couchbase.com/sync-gateway/current/config-properties.html#databases-foo_db-delta_sync .

Reporter: Oleg Kuzmin
E-mail: oleg.kuzmin@couchbase.com