Update GettingStarted.md
Update GettingStarted.md

Former-commit-id: 79e00bd5984b329b1d9936f3cb6b70a681572571
TrimBiggs/libnetwork-plugin,insequent/libcalico,Symmetric/libcalico,L-MA/libcalico,projectcalico/libnetwork-plugin,TrimBiggs/libnetwork-plugin,caseydavenport/libcalico,tomdee/libcalico,projectcalico/libcalico,robbrockbank/libcalico,TrimBiggs/libcalico,alexhersh/libcalico,djosborne/libcalico,plwhite/libcalico,tomdee/libnetwork-plugin