feat(rest): additional query historic options

- add following query options to the historic activity instance:
  * startedBefore,
  * startedAfter,
  * finsihedBefore and
  * finishedAfter
Merge branch 'master' of https://github.com/camunda/docs.camunda.org
fix(enterprise): add correct links to admin guides
Merge branch 'master' of https://github.com/camunda/docs.camunda.org