DOC-9312 Fix typo in user-manage example

Changes view_admin to views_admin

Change-Id: I93da40226a7fc35444c048a9c83270c8480957b6
Reviewed-on: http://review.couchbase.org/c/couchbase-cli/+/164084
Well-Formed: Restriction Checker
Reviewed-by: Patrick Varley <patrick@couchbase.com>
Tested-by: Daniel Owen <owend@couchbase.com>

Author: owend74