VFS: fix __start_dirop() kernel-doc warnings

Sphinx report kernel-doc warnings:

WARNING: ./fs/namei.c:2853 function parameter 'state' not described in '__start_dirop'
WARNING: ./fs/namei.c:2853 expecting prototype for start_dirop(). Prototype was for __start_dirop() instead

Fix them up.

Fixes: ff7c4ea ("VFS: add start_creating_killable() and start_removing_killable()")
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://patch.msgid.link/20251219024620.22880-3-bagasdotme@gmail.com
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: bagasme

fs/namei.c

@@ -2834,10 +2834,11 @@ static int filename_parentat(int dfd, struct filename *name,
 }
 
 /**
- * start_dirop - begin a create or remove dirop, performing locking and lookup
+ * __start_dirop - begin a create or remove dirop, performing locking and lookup
  * @parent:       the dentry of the parent in which the operation will occur
  * @name:         a qstr holding the name within that parent
  * @lookup_flags: intent and other lookup flags.
+ * @state:        task state bitmask
  *
  * The lookup is performed and necessary locks are taken so that, on success,
  * the returned dentry can be operated on safely.