move atomicity comment to RPC

buf/registry/module/v1beta1/commit_service.proto

@@ -35,10 +35,13 @@ service CommitService {
   rpc ListCommitHistory(ListCommitHistoryRequest) returns (ListCommitHistoryResponse) {
     option idempotency_level = NO_SIDE_EFFECTS;
   }
-  // Create commits on a Module with associated Content.
+  // Create commits on a Module with associated content (e.g. blobs, branches, tags).
   //
   // This is used by push and sync.
   //
+  // This operation is atomic. Either all Commits and associated content are created, or an error happens and none of
+  // them are created.
+  //
   // TODO: PushCommits? Something else? This is creating potentially a bunch of resources.
   rpc CreateCommits(CreateCommitsRequest) returns (CreateCommitsResponse) {
     option idempotency_level = IDEMPOTENT;
@@ -222,8 +225,6 @@ message CreateCommitsRequest {
   //
   // If there are already VCSCommits on the associated Module with a given hash, this
   // will result in an error. Otherwise, a new VCSCommit is created.
-  //
-  // This operation is atomic. Either all Commits are created, or an error happens and none of them are created.
   repeated AssociatedVCSCommit associated_vcs_commits = 6;
 }