Update Docs_ResourceItem_Button_Action to add appearance prop

[jkeohan]

Background

Resolves https://github.com/Shopify/core-issues/issues/66945

Solution

Remove kind from packages/ui-extensions/src/surfaces/customer-account/api/docs.ts > Docs_ResourceItem_Button_Action

🎩

• ...

Checklist

• I have 🎩'd these changes
• I have updated relevant documentation

[github-actions]

We detected some changes in packages/*/package.json or packages/*/src, and there are no updates in the .changeset directory. If the changes are user-facing and should cause a version bump, run yarn changeset to track your changes and include them in the next release CHANGELOG. If you are making simple updates to repo configuration, examples, or documentation, you do not need to add a changeset.