This print stylesheets prefer indexterms to be outside of <listitem>
tags or inside a <para> inside a <listitem>.

This changes :

<listitem>
  <indexterm><primary>core team</primary></indexterm>
  <para>The <link linkend="staff-core">FreeBSD core team</link>

into :

<listitem>
  <para>The <link linkend="staff-core">FreeBSD core team</link>
  <indexterm><primary>core team</primary></indexterm>

Theoretically, adding indexterms should never affect the normal flow,
but the last revision was adding extra blank lines into the postscript
output.