validations: Add link in comment to open issue (hashicorp#1472)

Author: radeksimko

internal/decoder/validations/unreferenced_origin.go

@@ -48,6 +48,7 @@ func UnreferencedOrigins(ctx context.Context, pathCtx *decoder.PathContext) lang
 		// we only initially validate variables & local values
 		// resources and data sources can have unknown schema
 		// and will be researched at a later point
+		// TODO: revisit as part of https://github.com/hashicorp/terraform-ls/issues/1364
 		supported := []string{"var", "local"}
 		firstStep := address[0].String()
 		if !slices.Contains(supported, firstStep) {