elfctl: update man page example for 'no' prefix

Reported by:	Mark Millard on freebsd-current@
Fixes:		c763f99d11 ("elfctl: prefix disable flags with "no"")
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation

usr.bin/elfctl/elfctl.1

@@ -26,7 +26,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd January 22, 2021
+.Dd February 4, 2022
 .Dt ELFCTL 1
 .Os
 .Sh NAME
@@ -85,7 +85,7 @@ of the
 command:
 .Bd -literal -offset indent
 elfctl file
-elfctl -e +aslr file
+elfctl -e +noaslr file
 .Ed
 .Pp
 Features may be specified as numerical values: