make version optional in versions update
@@ -223,7 +223,7 @@ Body parameters:
- `auth_data` (object): Required. algorithm-dependent data. For
`m.megolm_backup.v1.curve25519-aes-sha2`, see below for the [definition of
this property](#auth_data-backup-versions).
-- `version` (string): Required. The backup version. Must be the same as the query parameter or must be the current version.
+- `version` (string): Optional. The backup version. If present, must be the same as the path parameter.
Example:
