help: use a single paragraph to describe full and abbreviated nodeids
The texts describing 40-digit strings and the abbreviated form are
closely related, so make it a single paragraph.
<item>
<title>{bookmark|escape}</title>
<link>{urlbase}{url|urlescape}rev/{node|short}</link>
<description><![CDATA[{bookmark|strip|escape|addbreaks}]]></description>
<pubDate>{date|rfc822date}</pubDate>
</item>