Add information about 'update_settings.sh' script
Add information about 'update_settings.sh' script

Change-Id: I959488b8f7e0a9a2c3e7f1693301ea029afe1e07

olivierlemasle/murano,chenyujie/hybrid-murano,olivierlemasle/murano,DavidPurcell/murano_temp,openstack/murano,satish-avninetworks/murano,satish-avninetworks/murano,sajuptpm/murano,NeCTAR-RC/murano,DavidPurcell/murano_temp,NeCTAR-RC/murano,telefonicaid/murano,openstack/murano,satish-avninetworks/murano,DavidPurcell/murano_temp,DavidPurcell/murano_temp,sajuptpm/murano,NeCTAR-RC/murano,telefonicaid/murano,olivierlemasle/murano,olivierlemasle/murano,satish-avninetworks/murano,sergmelikyan/murano,NeCTAR-RC/murano,chenyujie/hybrid-murano,sergmelikyan/murano