nfs: Fix up documentation in nfs_follow_referral() and nfs_do_submount()

Fallout from the mount patches.
Signed-off-by: NTrond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/namespace.c

@@ -247,10 +247,7 @@ void nfs_release_automount_timer(void)
 
 /**
  * nfs_do_submount - set up mountpoint when crossing a filesystem boundary
- * @dentry: parent directory
- * @fh: filehandle for new root dentry
- * @fattr: attributes for new root inode
- * @authflavor: security flavor to use when performing the mount
+ * @fc: pointer to struct nfs_fs_context
  *
  */
 int nfs_do_submount(struct fs_context *fc)

fs/nfs/nfs4namespace.c

@@ -354,7 +354,7 @@ static int try_location(struct fs_context *fc,
 
 /**
  * nfs_follow_referral - set up mountpoint when hitting a referral on moved error
- * @dentry: parent directory
+ * @fc: pointer to struct nfs_fs_context
  * @locations: array of NFSv4 server location information
  *
  */