Email steps to migrate git-wip clone to gitbox

If you previously cloned from git-wip, the remote needs to be updated to the new gitbox endpoint.

1. Change remote

git remote -v
git remote set-url origin https://gitbox.apache.org/repos/asf/knox.git
git remote -v

2. (optional) Link github and ASF accounts - https://gitbox.apache.org/setup/