sh(1): Modernize the introduction a bit.

In particular, remove the text about ksh-like features, which are usually
taken for granted nowadays. The original Bourne shell is fading away and for
most users our /bin/sh is one of the most minimalistic they know.

bin/sh/sh.1

@@ -32,7 +32,7 @@
 .\"	from: @(#)sh.1	8.6 (Berkeley) 5/4/95
 .\" $FreeBSD$
 .\"
-.Dd October 31, 2010
+.Dd November 12, 2010
 .Dt SH 1
 .Os
 .Sh NAME
@@ -65,20 +65,13 @@ The
 utility is the standard command interpreter for the system.
 The current version of
 .Nm
-is in the process of being changed to
-conform with the
-.St -p1003.2
+is close to the
+.St -p1003.1
 specification for the shell.
-This version has many features which make
-it appear
-similar in some respects to the Korn shell, but it is not a Korn
-shell clone like
-.Nm pdksh .
-Only features
+It only supports features
 designated by
 .Tn POSIX ,
-plus a few Berkeley extensions, are being
-incorporated into this shell.
+plus a few Berkeley extensions.
 This man page is not intended to be a tutorial nor a complete
 specification of the shell.
 .Ss Overview