pygments doesn't support sensitive function for Terraform

[staceysalamon-aiven]

What's wrong?

For information - no action needed

When using sensitive in fields for Terraform, the build fails because pygments doesn't support this function.

For now, this means that in code blocks that use this, we need to use the literal (::) instead of .. code:: terraform syntax. If pygments supports this format in the future, then we will be able to go back to using the code block syntax for these sample files.

For reference, see this PR and Slack discussion.