Backport of docs: amend HCL templates/functions docs into release/1.9.x #12677
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Backport
This PR is auto-generated from #12672 to be assessed for backporting due to the inclusion of the label backport/website.
The below text is copied from the body of the original PR.
The HCL2 docs on built-in functions contains a link to a non-existent section of the expressions page, so we update it to link to the general page, and to the string interpolation section, since it is a common use case.
Closes: #12670
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