Added write-only support to generate

[rainkwan]

For the generate command, updated the render logic using terraform-json to add WriteOnly.

For an example JSON Attribute:

## Schema

### Optional

            "write_only_string_attribute": {
                "type": "string",
                "description": "example write only string attribute",
                "description_kind": "markdown",
                "optional": true,
                "write_only": true
            }

We get the following md:

## Schema

### Optional

- `write_only_string_attribute` (String, Write-only) example write only string attribute

[hashicorp-cla-app]

All committers have signed the CLA.

[austinvalle]

All the changes here look good! Two general comments to consider:

• We'll want to add a callout somewhere on the markdown page, like -> Write-only attributes are supported in Terraform 1.11 and later. (we already started a thread offline about it)
• We'll want a changelog for this new functionality!

[rainkwan]

All the changes here look good! Two general comments to consider:

• We'll want to add a callout somewhere on the markdown page, like -> Write-only attributes are supported in Terraform 1.11 and later. (we already started a thread offline about it)
• We'll want a changelog for this new functionality!

Added the changelog but decided maybe we should just merge this PR and later add the link to write-only docs when it is available and the render logic for printing out that it is only supported in Terraform 1.11 in a different PR.

[austinvalle]

... but decided maybe we should just merge this PR and later add the link to write-only docs when it is available and the render logic for printing out that it is only supported in Terraform 1.11 in a different PR.

Yeah if you want to open a separate PR for that before we release v0.21.0 of plugin-docs, sounds good to me! 🚀