[DOCS] Remove ML item from release notes
[DOCS] Remove ML item from release notes

Original commit: elastic/x-pack-elasticsearch@39cc4aa8b3c60118fbf3542decc0a71b4755e024

strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elassandra,strapdata/elassandra,vroyer/elassandra