tech-refer: build fix: s/python/Python

Signed-off-by: Dunrong Huang <riegamaths@gmail.com>
admin-guide/data-center: finish event tab

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

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