CHAGELOG-3.6: Remove etcdutl snapshot save removal note

`etcdutl snapshot save` never made it to v3.5, so there's no need to
list it as a deprecation/removal.

Signed-off-by: Ivan Valdes <[email protected]>

Author: ivanvc

CHANGELOG/CHANGELOG-3.6.md

@@ -87,7 +87,6 @@ See [code changes](https://github.com/etcd-io/etcd/compare/v3.5.0...v3.6.0).
 - Removed [etcdctl defrag --data-dir](https://github.com/etcd-io/etcd/pull/13793).
 - Removed [etcdctl snapshot status](https://github.com/etcd-io/etcd/pull/13809).
 - Removed [etcdctl snapshot restore](https://github.com/etcd-io/etcd/pull/13809).
-- Removed [etcdutl snapshot save](https://github.com/etcd-io/etcd/pull/13809).
 - Removed [NewZapCoreLoggerBuilder in server/embed](https://github.com/etcd-io/etcd/pull/19404)
 
 ### etcdctl v3