chore: update doc comment on pactffi_write_pact_file
@@ -345,6 +345,9 @@ pub extern fn pactffi_cleanup_mock_server(mock_server_port: i32) -> bool {
/// Returns 0 if the pact file was successfully written. Returns a positive code if the file can
/// not be written, or there is no mock server running on that port or the function panics.
///
+/// **NOTE:** This function does not know about the spec version, and will write the pact file
+/// in V4 format. If you require a Pact file in an earlier format, use `pactffi_pact_handle_write_file` instead.
+///
/// # Errors
///
/// Errors are returned as positive values.
