website: Migration guide updates for provider.DataSourceType and provider.ResourceType deprecation

[bflad]

Reference: #472

Note: The source code reference links to the http, random, and tls providers will be out of date until they are migrated after this functionality is released in the framework. I'm guessing we should hold off merging this until after they are migrated?

[bendbennett]

Reference: #472

Note: The source code reference links to the http, random, and tls providers will be out of date until they are migrated after this functionality is released in the framework. I'm guessing we should hold off merging this until after they are migrated?

We could update the migration docs to remove source code links and replace with generic code examples?

[bendbennett]

LGTM

[bflad]

I think I caught all the links pointing to code that was updated.

We could update the migration docs to remove source code links and replace with generic code examples?

I'm generally a proponent of this approach as we can show code with only the necessary context and without needing to update links while the framework is under development, but that can be an exercise done separately. 👍

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