Update documentation with new archive configuration

doc/04-schema.md

@@ -810,6 +810,11 @@ The following options are supported:
   updates when in non-interactive mode. `true` will always discard changes in
   vendors, while `"stash"` will try to stash and reapply. Use this for CI
   servers or deploy scripts if you tend to have modified vendors.
+* **archive-format:** Defaults to `tar`. Composer allows you to add a default
+  archive format when the workflow needs to create a dedicated archiving format.
+* **archive-dir:** Defaults to `.`. Composer allows you to add a default
+  archive directory when the workflow needs to create a dedicated archiving format.
+  Or for easier development between modules.
 
 Example: