Include fs/open.c in filesystems/api-summary.rst to provide its
exported APIs.

Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
---
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: linux-fsdevel@vger.kernel.org

 Documentation/filesystems/api-summary.rst |    3 +++
 1 file changed, 3 insertions(+)

--- linux-next-20251219.orig/Documentation/filesystems/api-summary.rst
+++ linux-next-20251219/Documentation/filesystems/api-summary.rst
@@ -56,6 +56,9 @@ Other Functions
 .. kernel-doc:: fs/namei.c
    :export:
 
+.. kernel-doc:: fs/open.c
+   :export:
+
 .. kernel-doc:: block/bio.c
    :export: