Remove/simplify historic shell lesson; fix sentence fragment. ok deraadt@

usr.bin/script/script.1

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: script.1,v 1.16 2018/07/13 16:59:46 cheloha Exp $
+.\"	$OpenBSD: script.1,v 1.17 2019/02/15 02:49:24 ian Exp $
 .\"	$NetBSD: script.1,v 1.3 1994/12/21 08:55:41 jtc Exp $
 .\"
 .\" Copyright (c) 1980, 1990, 1993
@@ -30,7 +30,7 @@
 .\"
 .\"	@(#)script.1	8.1 (Berkeley) 6/6/93
 .\"
-.Dd $Mdocdate: July 13 2018 $
+.Dd $Mdocdate: February 15 2019 $
 .Dt SCRIPT 1
 .Os
 .Sh NAME
@@ -73,24 +73,15 @@ instead of an interactive shell.
 To run a command with arguments, enclose both in quotes.
 .El
 .Pp
-The script ends when the forked program exits (a control-D
-.Pq Ql ^D
-to exit
-the Bourne shell
-.Pf ( Xr sh 1 ) ,
-and
+The script ends when the forked program exits (an 
 .Ic exit ,
 .Ic logout ,
 or control-D
-(if
-.Va ignoreeof
-is not set) for the
-C-shell,
-.Xr csh 1 ) .
+.Pq Ql ^D
+will exit most interactive shells).
 .Nm
 will exit with the status of 0 unless any of its child
-processes fail.
-In which case,
+processes fail, in which case,
 .Nm
 will return 1.
 .Pp