[cli-reference] remove unnecessary subcommand list for freezer

At now, python-freezerclient provides a standard command completion.
Therefore, no need to maintain the static subcommand list.

Change-Id: If1dffcb57888e52949bf0814d56f75eda7f2958e

os_doc_tools/resources/clients.yaml

@@ -15,35 +15,6 @@ designate:
     subcommands: complete
 freezer:
     name: Backup, Restore, and Disaster Recovery service (freezer)
-    subcommands:
-      - job-show
-      - job-list
-      - job-create
-      - job-get
-      - job-delete
-      - job-start
-      - job-stop
-      - job-abort
-      - job-update
-      - client-list
-      - client-show
-      - client-register
-      - client-delete
-      - backup-list
-      - backup-show
-      - session-list
-      - session-show
-      - session-create
-      - session-add-job
-      - session-remove-job
-      - session-start
-      - session-end
-      - session-update
-      - action-show
-      - action-list
-      - action-delete
-      - action-create
-      - action-update
 glance:
     name: Image service (glance)
 gnocchi: