@pose Fixes a bug in the doc that prevents completion of the build in `pulumi/registry`.
Related to: https://github.com/pulumi/registry/pull/8814 Make this provider follow the Pulumi official convention of [using the `_index.md` and `installation-configuration.md`](https://www.pulumi.com/docs/iac/build-with-pulumi/publishing-packages/#write-documentation).