filelock: __fcntl_getlease: fix kernel-doc warnings

Use the correct function name and add description for the @flavor
parameter to avoid these kernel-doc warnings:

Warning: fs/locks.c:1706 function parameter 'flavor' not described in
 '__fcntl_getlease'
WARNING: fs/locks.c:1706 expecting prototype for fcntl_getlease().
 Prototype was for __fcntl_getlease() instead

Fixes: 1602bad ("vfs: expose delegation support to userland")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20251128000826.457120-1-rdunlap@infradead.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: rddunlap

fs/locks.c

@@ -1681,8 +1681,9 @@ void lease_get_mtime(struct inode *inode, struct timespec64 *time)
 EXPORT_SYMBOL(lease_get_mtime);
 
 /**
- *	fcntl_getlease - Enquire what lease is currently active
+ *	__fcntl_getlease - Enquire what lease is currently active
  *	@filp: the file
+ *	@flavor: type of lease flags to check
  *
  *	The value returned by this function will be one of
  *	(if no lease break is pending):