Update Triggers documentation per EE

This backports a line from EE so that both the CE and EE code are
identical.

lib/api/triggers.rb

@@ -13,7 +13,7 @@ module API
       end
       params do
         requires :ref, type: String, desc: 'The commit sha or name of a branch or tag', allow_blank: false
-        requires :token, type: String, desc: 'The unique token of trigger'
+        requires :token, type: String, desc: 'The unique token of trigger or job token'
         optional :variables, type: Hash, desc: 'The list of variables to be injected into build'
       end
       post ":id/(ref/:ref/)trigger/pipeline", requirements: { ref: /.+/ } do