[DOCS] Added 6.1.1 PRs to release notes
[DOCS] Added 6.1.1 PRs to release notes

Original commit: elastic/x-pack-elasticsearch@fe1b2f0d38e99f23bde727d47654db1b0e444337

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