generaldelta: mark experimental reordering option

mercurial/changegroup.py

@@ -283,6 +283,7 b' class cg1packer(object):'
         if bundlecaps is None:
             bundlecaps = set()
         self._bundlecaps = bundlecaps
+        # experimental config: bundle.reorder
         reorder = repo.ui.config('bundle', 'reorder', 'auto')
         if reorder == 'auto':
             reorder = None