Merge pull request #31991 from sigwinch28/patch-1

Document provider registry response property shasum

website/docs/internals/provider-registry-protocol.mdx

@@ -319,6 +319,9 @@ A successful result is a JSON object with the following properties:
 * `shasums_signature_url` (required): a URL from which Terraform can retrieve
   a binary, detached GPG signature for the document at `shasums_url`, signed
   by one of the keys indicated in the `signing_keys` property.
+  
+* `shasum` (required): the SHA256 checksum for this provider's zip archive as
+  recorded in the shasums document.
 
 * `signing_keys` (required): an object describing signing keys for this
   provider package, one of which must have been used to produce the signature