[DOCS] Format the authenticate API (elastic/x-pack-elasticsearch#2572)
[DOCS] Format the authenticate API (elastic/x-pack-elasticsearch#2572)

Original commit: elastic/x-pack-elasticsearch@7e25f952370471a826ae62ba968471c77732605c

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