Backport of docs: Fix links and headers into v1.6

[teamterraform]

Backport

This PR is auto-generated from #35033 to be assessed for backporting due to the inclusion of the label 1.6-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:
@ritsok
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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Small fixes for text and headers.

Target Release

1.8.x, 1.7.x, 1.6.x

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Overview of commits

• 0eac58d - a0276a4 - 1fd45d8 - 1b5966d - 9babc8a - 644910d - 471dd39 - b772867 - a344e83

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[rkoron007]

Not backporting