tty: tty_ldisc: fix doc warnings in tty_ldisc.c

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

 drivers/tty/tty_ldisc.c:63: warning: Excess function
  parameter 'disc' description in 'tty_register_ldisc'
 drivers/tty/tty_ldisc.c:90: warning: Function parameter or
  member 'ldisc' not described in 'tty_unregister_ldisc'
 drivers/tty/tty_ldisc.c:90: warning: Excess function
  parameter 'disc' description in 'tty_unregister_ldisc'

Signed-off-by: Baokun Li <libaokun1@huawei.com>
Link: https://lore.kernel.org/r/20210608024843.2756746-1-libaokun1@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/tty/tty_ldisc.c b/drivers/tty/tty_ldisc.c
index 8edd73ab9..756a4bf 100644
--- a/drivers/tty/tty_ldisc.c
+++ b/drivers/tty/tty_ldisc.c
@@ -48,7 +48,6 @@ static struct tty_ldisc_ops *tty_ldiscs[NR_LDISCS];
 
 /**
  *	tty_register_ldisc	-	install a line discipline
- *	@disc: ldisc number
  *	@new_ldisc: pointer to the ldisc object
  *
  *	Installs a new line discipline into the kernel. The discipline
@@ -77,7 +76,7 @@ EXPORT_SYMBOL(tty_register_ldisc);
 
 /**
  *	tty_unregister_ldisc	-	unload a line discipline
- *	@disc: ldisc number
+ *	@ldisc: ldisc number
  *
  *	Remove a line discipline from the kernel providing it is not
  *	currently in use.