ecryptfs: dentry: File headers are not good candidates for kernel-doc

Fixes the following W=1 kernel build warning(s):

fs/ecryptfs/dentry.c:19: warning: Incorrect use of kernel-doc format: * ecryptfs_d_revalidate - revalidate an ecryptfs dentry
fs/ecryptfs/dentry.c:32: warning: Function parameter or member 'dentry' not described in 'ecryptfs_d_revalidate'
fs/ecryptfs/dentry.c:32: warning: Function parameter or member 'flags' not described in 'ecryptfs_d_revalidate'
fs/ecryptfs/dentry.c:32: warning: expecting prototype for eCryptfs(). Prototype was for ecryptfs_d_revalidate() instead

Cc: Tyler Hicks <[e-mail]>
Cc: "Michael A. Halcrow" <[e-mail]>
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Signed-off-by: Tyler Hicks <[e-mail]>

fs/ecryptfs/dentry.c

···
 // SPDX-License-Identifier: GPL-2.0-or-later
-/**
+/*
  * eCryptfs: Linux filesystem encryption layer
  *
  * Copyright (C) 1997-2003 Erez Zadok