Merge branch 'docs/jira-redirect' into 'master'

Change wording in JIRA doc so that redirect in
the docs portal will work.

See merge request !908

doc/integration/jira.md

 # GitLab JIRA integration
 
-This document was moved under [project_services/jira](../project_services/jira.md).
+This document was moved to [project_services/jira](../project_services/jira.md).