Fix documentation for cutting release on contributing.md

[ashahi1]

@lipingxue it seems you have to resolve merge correctly.

<<<<<<< HEAD
# Run the script misc/scripts/update_GHpages.sh
./misc/scripts/update_GHpages.sh
=======
# 1. Checkout the gh-pages branch
git checkout gh-pages

# 2. Go to jekyll-docs directory
cd jekyll-docs

# 3. Build the jekyll site
docker run --rm --volume=$(pwd):/srv/jekyll -it jekyll/jekyll:stable jekyll build

# 4. Remove the old site and copy the new one.
rm -rvf ../documentation
mv _site ../documentation

# 5.Search for "Edit me" and ensure href is https://github.com/vmware/docker-volume-vsphere/edit/gh-pages/jekyll-docs//index.md
#Bug in jekyll template does not render the name "index"
vi ../documentation/index.html

# 6. Push to GitHub
git add documentation
git commit
git push origin gh-pages
>>>>>>> Add documment about releases for GA and post GA.