[manila] Config refernce update for Mitaka

Change-Id: Ibab8c2f3c73d44213c179bd4b40c0dabd37cc3b7

doc/config-reference/source/shared-file-systems/log-files.rst

@@ -25,3 +25,6 @@ runs.
    * - ``share.log``
      - ``openstack-manila-share``
      - ``manila-share``
+   * - ``data.log``
+     - ``openstack-manila-data``
+     - ``manila-data``

doc/config-reference/source/shared-file-systems/overview.rst

@@ -12,6 +12,11 @@ manila-api
    throughout the Shared File Systems service. It supports the OpenStack
    APIs.
 
+manila-data
+  A standalone service whose purpose is to receive requests, process data
+  operations with potentially long running time such as copying, share
+  migration or backup.
+
 manila-scheduler
    Schedules and routes requests to the appropriate
    share service. The scheduler uses configurable filters and weighers