Update CONTRIBUTING.md
Summary
Current development branch is 2.3-dev.
The sample commands in /go/CONTRIBUTING.md
git pull
git checkout 2.2-dev
git checkout -B ##-shortdescriptionshould be updated to 2.3-dev instead.
Current development branch is 2.3-dev.
The sample commands in /go/CONTRIBUTING.md
git pull
git checkout 2.2-dev
git checkout -B ##-shortdescriptionshould be updated to 2.3-dev instead.