[IMDS Lockdown] Add example of usage to imds-access.sh helper.

[gmarciani]

Description of changes

Add example of usage to imds-access.sh helper.

Tests

• Verified that the helper is printed correctly
• Verified that imds access script works correctly (allow,deny,flush)

References

• Link to impacted open issues.
• Link to related PRs in other packages (i.e. cookbook, node).
• Link to documentation useful to understand the changes.

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

Please review the guidelines for contributing and Pull Request Instructions.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.63%. Comparing base (a21a33e) to head (f1c60e1).
Report is 7 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2868   +/-   ##
========================================
  Coverage    76.63%   76.63%           
========================================
  Files           22       22           
  Lines         2243     2243           
========================================
  Hits          1719     1719           
  Misses         524      524           

Flag	Coverage Δ
unittests	76.63% <ø> (ø)

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