Enhance linux instructions
Enhance linux instructions

- recommend running as root
- make sure Git is installed
Annyv2/docs,jeffreylees/docs,auth0/docs,yvonnewilson/docs,khorne3/docs,Catografix/docs,jeffreylees/docs,hamzawi06/docs,hamzawi06/docs,Catografix/docs,yvonnewilson/docs,sandrinodimattia/docs,miparnisari/docs,hamzawi06/docs,auth0/docs,Catografix/docs,Annyv2/docs,jeffreylees/docs,auth0/docs,sandrinodimattia/docs,sandrinodimattia/docs,Annyv2/docs,khorne3/docs,khorne3/docs,yvonnewilson/docs