Delete obsolete .IX macro from man pages

man/dknewkey.1

@@ -127,18 +127,15 @@
 .rm #[ #] #H #V #F C
 .\" ========================================================================
 .\"
-.IX Title "dknewkey 1"
 .TH dknewkey 1 "2018-02-05"
 .SH "NAME"
 dknewkey
 \-
 Generates new DKIM public/private key pairs
 .SH "VERSION"
-.IX Header "VERSION"
 0\.8\.0
 
 .SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
 
 dknewykey generates new DKIM keys.
 
@@ -153,7 +150,6 @@ prevent inadvertent use with the now obsolete sha1 hash algorithm (See RFC
 8301).
 
 .SH "USAGE"
-.IX Header "USAGE"
 
 dknewkey.py [\-h] [\-\-ktype {rsa,ed25519}] key_name
 
@@ -169,7 +165,6 @@ NOTE: Depending on the packaging and distribution, the exact path and name for
 the executable may vary.
 
 .SH "AUTHORS"
-.IX Header "AUTHORS"
 This version of \fBdknewkey\fR was written by Brandon Long <blong@google.com>.
 It has been substantially rewritten by Scott Kitterman <scott@kitterman.com>.
 .PP