Backport of updated some of the boilerplate text into v1.8

[github-actions]

Backport

This PR is auto-generated from #36761 to be assessed for backporting due to the inclusion of the label 1.8-backport.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@trujillo-adam
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: POST https://api.github.com/repos/hashicorp/terraform/merges: 409 Merge conflict []

The below text is copied from the body of the original PR.

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This PR makes minor updates to the format and text for alignment with the language block reference design doc.

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Overview of commits

• 0cd73ab

[hashicorp-cla-app]

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1 out of 2 committers have signed the CLA.

• trujillo-adam
• temp

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[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[github-actions]

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