Update GettingStarted.md
Update GettingStarted.md

Former-commit-id: 88fe28d79ea0716bbfe5c25f3f516138fa440a8d
plwhite/libcalico,TrimBiggs/libcalico,robbrockbank/libcalico,TrimBiggs/libnetwork-plugin,Symmetric/libcalico,TrimBiggs/libnetwork-plugin,insequent/libcalico,tomdee/libnetwork-plugin,caseydavenport/libcalico,alexhersh/libcalico,projectcalico/libnetwork-plugin,L-MA/libcalico,projectcalico/libcalico,djosborne/libcalico,tomdee/libcalico