---
fixes:
  - |
    [`bug 1779889 <https://bugs.launchpad.net/keystone/+bug/1779889>`_]
    Adds documentation about service tokens and configuring services to use
    service tokens for long running operations.

Add release note for service token documentation
Add release note for service token documentation

Change-Id: I779c58d4ab15c34c40bdcab98ec926bf7f7c4c31
