[DOCS] Fixed typo in calendar API
Original commit: elastic/x-pack-elasticsearch@7e4a38577f2a5b31e6ee15a895b7d6927c447adf
<titleabbrev>Add Jobs to Calendar</titleabbrev>
++++
-The add jobs to calendar API enables you to remove jobs from a calendar.
+The add jobs to calendar API enables you to add jobs to a calendar.
==== Request
