[PATCH v2 3/4] shallow.h: document '{commit,rollback}_shallow_file'

[Taylor Blau <me@ttaylorr.com>]

When 'commit_shallow_file()' and 'rollback_shallow_file()' were
introduced, they did not have a documenting comment, when they could
have benefited from one.

Add a brief note about what these functions do, and make a special note
that they reset stat-validity checks.

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
---
 shallow.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/shallow.h b/shallow.h
index b50a85ed7e..b3bf200bf9 100644
--- a/shallow.h
+++ b/shallow.h
@@ -10,7 +10,9 @@ void set_alternate_shallow_file(struct repository *r, const char *path, int over
 int register_shallow(struct repository *r, const struct object_id *oid);
 int unregister_shallow(const struct object_id *oid);
 int is_repository_shallow(struct repository *r);
+/* commit $GIT_DIR/shallow and reset stat-validity checks */
 int commit_shallow_file(struct repository *r, struct lock_file *lk);
+/* rollback $GIT_DIR/shallow and reset stat-validity checks */
 void rollback_shallow_file(struct repository *r, struct lock_file *lk);
 
 struct commit_list *get_shallow_commits(struct object_array *heads,
-- 
2.26.0.113.ge9739cdccc