Adding examples with EC2Cluster example (#217)

* Update aws.rst

* Update aws.rst

* Update aws.rst

* Update aws.rst

* Update aws.rst

* Update aws.rst

* Update ec2.py

* Update ec2.py

* Refactor new documentation a little

* adding examples

Co-authored-by: Jacob Tomlinson <jtomlinson@nvidia.com>
Co-authored-by: Rajan Arora <rajana@nvidia.com>
Co-authored-by: Jacob Tomlinson <jacobtomlinson@users.noreply.github.com>