update nodejs on ubuntu code example

Example 1: updating node js ubuntu

curl -sL https://deb.nodesource.com/setup_14.x | sudo -E bash -
sudo apt-get install -y nodejs

Example 2: update npm ubuntu

update npm ubuntu

Example 3: update nodejs ubuntu

curl -sL https://deb.nodesource.com/setup_15.x | sudo -E bash -
sudo apt-get install -y nodejs