docs/provider: Remove mention of side navigation file in Contributing…

… Guide

Reference: #14712

The `website/aws.erb` file no longer has any effect and will be removed in the future.

docs/contributing/contribution-checklists.md

@@ -474,12 +474,9 @@ guidelines.
 - [ ] __Arguments_and_Attributes__: The HCL for arguments and attributes should
    mimic the types and structs presented by the AWS API. API arguments should be
    converted from `CamelCase` to `camel_case`.
-- [ ] __Documentation__: Each resource gets a page in the Terraform
-   documentation. The [Terraform website][website] source is in this
-   repo and includes instructions for getting a local copy of the site up and
-   running if you'd like to preview your changes. For a resource, you'll want
-   to add a new file in the appropriate place and add a link to the sidebar for
-   that page.
+- [ ] __Documentation__: Each data source and resource gets a page in the Terraform
+   documentation, which lives at `website/docs/d/<service>_<name>.html.markdown` and
+   `website/docs/r/<service>_<name>.html.markdown` respectively.
 - [ ] __Well-formed Code__: Do your best to follow existing conventions you
    see in the codebase, and ensure your code is formatted with `go fmt`.
    The PR reviewers can help out on this front, and may provide comments with