Doc: refer to the "commit-graph file" with dash

diff --git a/refs.h b/refs.h
index cc2fb4c68c0e194dc51e3846192911c2c6949c6b..bd52c1bbae3a68fe8ca8f9e6cae7cc54bdbf9852 100644 (file)
--- a/refs.h
+++ b/refs.h
@@ -3,8 +3,10 @@
 
 struct object_id;
 struct ref_store;
+struct repository;
 struct strbuf;
 struct string_list;
+struct string_list_item;
 struct worktree;
 
 /*