* Update URLs from www.terraform.io to developer.hashicorp.com
* More updates to URLs linking to documentation in documentation and user-facing warnings/errors
* More updates to URLs linking to documentation, in docs, code, test fixtures
* Replace www.terraform.io/community with link to Community Forum
* Apply suggestions from code review
Co-authored-by: Rose M Koron <32436232+rkoron007@users.noreply.github.com>
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Co-authored-by: Rose M Koron <32436232+rkoron007@users.noreply.github.com>
* Add documentation describing how to update the plugin protocol
* Fix typo
* Minor edits
* Refactor docs to ensure the protocol semver goes up by one minor once per Terraform minor release.
* Edit a word
This is an initial partial description of the plugin protocol focused
mainly on explaining the purpose of the .proto files. In subsequent
updates we will also document the negotiation protocol, etc.
For this first pass the goal was just to publish some information that was
already available in an internal design document so that it's visible to
SDK implementers. It is focused on the .proto versioning strategy because
that was the main topic of the internal design documentation this was
based on.
