The description and examples are updated for the airshipctl
commands, which will be inturn used for generating documentation.
Please ignore the .md file changes in this PS. They are added for zuul
gates to pass. Here is the PS with generated documention
files https://review.opendev.org/c/airship/airshipctl/+/789250
Relates-To: #280
Change-Id: I3587ad211f7d614b5cc6a162ca352ac54c3b90f0