sh(1): Remove xrefs for expr(1) and getopt(1).

expr(1) should usually not be used as various forms of parameter expansion
and arithmetic expansion replicate most of its functionality in an easier
way.

getopt(1) should not be used at all in new code. Instead, getopts(1) or
entirely manual parsing should be used.

MFC after:	1 week

bin/sh/sh.1

@@ -32,7 +32,7 @@
 .\"	from: @(#)sh.1	8.6 (Berkeley) 5/4/95
 .\" $FreeBSD$
 .\"
-.Dd August 22, 2010
+.Dd September 10, 2010
 .Dt SH 1
 .Os
 .Sh NAME
@@ -2455,8 +2455,6 @@ will return the argument.
 .Xr echo 1 ,
 .Xr ed 1 ,
 .Xr emacs 1 ,
-.Xr expr 1 ,
-.Xr getopt 1 ,
 .Xr pwd 1 ,
 .Xr test 1 ,
 .Xr vi 1 ,