admin/data-center: finish explanation of settings data center

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>
admin/data-center: finish editing a resource

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>
admin/data-center: finish creating logical network

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>
admin/data-center: finish re-initialing data-center

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>
admin/data-center: finish (force) removing data center

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>
admin/data-center: use space instead of TAB to align

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>