This updates the supervisor example documentation
to use an up-to-date version of Ubuntu.
Also reduced the use of "royal We", and tweaked some
language.
Finally, added some language hints for code-highlighting.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Upstream-commit: e38678e6601cc597b621aaf3cf630419a7963ae9
Component: engine