$ git clone https://github.com/YOUR-USERNAME/jakartaee-firstcup.git
$ git remote add upstream https://github.com/eclipse-ee4j/jakartaee-firstcup.git
$ git remote -v
origin https://github.com/YOUR-USERNAME/jakartaee-firstcup.git (fetch)
origin https://github.com/YOUR-USERNAME/jakartaee-firstcup.git (push)
upstream https://github.com/eclipse-ee4j/jakartaee-firstcup.git (fetch)
upstream https://github.com/eclipse-ee4j/jakartaee-firstcup.git (push)
$ git fetch upstream
$ git checkout master
$ git merge upstream/master
$ git push origin master # push local master to github fork.
$ git checkout -b doc_update
$ git add src/main/jbake/content/my.adoc
$ git commit -m "my commit message"
$ git push origin doc_update