Add and correct reference links in 5.14 securing-sensu.md (#1831)
Add and correct reference links in 5.14 securing-sensu.md (#1831)

* add replicators api page

* update and rename federation api doc

* add federation reference

* update reference links and minor text cleanup

* Delete federation.md

* Delete federation.md

sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs,sensu/sensu-docs