Removed duplicate parameter in v2-admin api-ref
Removed duplicate parameter in v2-admin api-ref

user_id was listed twice under the update user request parameters.
This fix removes the duplicated parameter.

Change-Id: I9c70aff00f151c4907101335174adf3624d4f686

ilay09/keystone,rajalokan/keystone,rajalokan/keystone,openstack/keystone,openstack/keystone,cernops/keystone,mahak/keystone,openstack/keystone,mahak/keystone,mahak/keystone,rajalokan/keystone,ilay09/keystone,cernops/keystone,ilay09/keystone