Merge branch 'mh/replace-refs-variable-rename'

* mh/replace-refs-variable-rename:
  Document some functions defined in object.c
  Add docstrings for lookup_replace_object() and do_lookup_replace_object()
  rename read_replace_refs to check_replace_refs

builtin/pack-objects.c

@@ -2612,7 +2612,7 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
 		OPT_END(),
 	};
 
-	read_replace_refs = 0;
+	check_replace_refs = 0;
 
 	reset_pack_idx_option(&pack_idx_opts);
 	git_config(git_pack_config, NULL);