* Fix s3 URLs so that they work
Unfortunately, s3 urls prefixed with https:// do NOT work with the underlying go-getter library. As such, this fixes the examples so that they are working examples that won't cause problems for people reading the docs.
See discussion in https://github.com/hashicorp/nomad/issues/1113 circa 2016.
* Use s3:// protocol schema for artifact examples
Per the discussion in https://github.com/hashicorp/nomad/pull/15123,
we're going to use the explicit s3 protocol in the examples since that
is the likeliest to work in all scenarios
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