Update GettingStarted.md
Update GettingStarted.md

Former-commit-id: b8a972e8327a5e21738e3834797b369077170b0c
alexhersh/libcalico,projectcalico/libcalico,TrimBiggs/libnetwork-plugin,Symmetric/libcalico,TrimBiggs/libnetwork-plugin,robbrockbank/libcalico,djosborne/libcalico,TrimBiggs/libcalico,insequent/libcalico,L-MA/libcalico,tomdee/libnetwork-plugin,caseydavenport/libcalico,plwhite/libcalico,projectcalico/libnetwork-plugin,tomdee/libcalico