Update module github.com/hashicorp/terraform-plugin-docs to v0.20.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/hashicorp/terraform-plugin-docs	v0.20.0 -> v0.20.1

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Release Notes

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

v0.20.1

Compare Source

BUG FIXES:

• validate: Fixed a bug that caused false positive validation errors for resource types that have the same name as the provider. (#​419)
• generate: Fixed a bug that caused all generated resource documentation to have the same content when the provider has a resource type with the same name as the provider. (#​419)
• generate: Fixed a bug that would return an error when a static file exists in both templates and docs, which will now be ignored. (#​421)

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