[docs] Fix small typo in docs about automated tests
[docs] Fix small typo in docs about automated tests

Change-Id: I417498304c72eedb7680cd0e646db04f3574c4de

openstack/murano,openstack/murano,DavidPurcell/murano_temp,DavidPurcell/murano_temp,DavidPurcell/murano_temp,DavidPurcell/murano_temp