tty: tty_audit: Demote non-conformant kernel-doc headers

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

drivers/tty/tty_audit.c:91: warning: Function parameter or member 'buf' not described in 'tty_audit_buf_push'
drivers/tty/tty_audit.c:129: warning: Function parameter or member 'sig' not described in 'tty_audit_fork'
drivers/tty/tty_audit.c:137: warning: Function parameter or member 'tty' not described in 'tty_audit_tiocsti'
drivers/tty/tty_audit.c:137: warning: Function parameter or member 'ch' not described in 'tty_audit_tiocsti'
drivers/tty/tty_audit.c:202: warning: Function parameter or member 'tty' not described in 'tty_audit_add_data'
drivers/tty/tty_audit.c:202: warning: Function parameter or member 'data' not described in 'tty_audit_add_data'
drivers/tty/tty_audit.c:202: warning: Function parameter or member 'size' not described in 'tty_audit_add_data'

Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Jiri Slaby <[e-mail]>
Cc: Miloslav Trmac <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/tty/tty_audit.c

···
 	}
 }
 
-/**
+/*
  *	tty_audit_buf_push	-	Push buffered data out
  *
  *	Generate an audit message from the contents of @buf, which is owned by
···
 	tty_audit_buf_free(buf);
 }
 
-/**
+/*
  *	tty_audit_fork	-	Copy TTY audit state for a new task
  *
  *	Set up TTY audit state in @sig from current.  @sig needs no locking.
···
 	sig->audit_tty = current->signal->audit_tty;
 }
 
-/**
+/*
  *	tty_audit_tiocsti	-	Log TIOCSTI
  */
 void tty_audit_tiocsti(struct tty_struct *tty, char ch)
···
 		tty_audit_log("ioctl=TIOCSTI", dev, &ch, 1);
 }
 
-/**
+/*
  *	tty_audit_push	-	Flush current's pending audit data
  *
  *	Returns 0 if success, -EPERM if tty audit is disabled
···
 	return 0;
 }
 
-/**
+/*
  *	tty_audit_buf_get	-	Get an audit buffer.
  *
  *	Get an audit buffer, allocate it if necessary.  Return %NULL
···
 	return tty_audit_buf_ref();
 }
 
-/**
+/*
  *	tty_audit_add_data	-	Add data for TTY auditing.
  *
  *	Audit @data of @size from @tty, if necessary.