fix(deps): update module github.com/hashicorp/terraform-plugin-docs to v0.18.0 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/hashicorp/terraform-plugin-docs	v0.17.0 -> v0.18.0

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Release Notes

hashicorp/terraform-plugin-docs (github.com/hashicorp/terraform-plugin-docs)

### [`v0.18.0`](https://togithub.com/hashicorp/terraform-plugin-docs/releases/tag/v0.18.0) [Compare Source](https://togithub.com/hashicorp/terraform-plugin-docs/compare/v0.17.0...v0.18.0) FEATURES: - generate: Add support for Provider-defined Function documentation ([#​328](https://togithub.com/hashicorp/terraform-plugin-docs/issues/328)) - migrate: Add support for Provider-defined Function documentation ([#​328](https://togithub.com/hashicorp/terraform-plugin-docs/issues/328)) ENHANCEMENTS: - validate: Add `functions` to list of allowed template and rendered website subdirectories ([#​328](https://togithub.com/hashicorp/terraform-plugin-docs/issues/328))

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Configuration

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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