Fix tag names

Introduced in php#2469

Author: kocsismate

reference/xsl/xsltprocessor/transformtodoc.xml

@@ -26,7 +26,7 @@
      <term><parameter>document</parameter></term>
      <listitem>
       <para>
-       The <type>DOMDocument</type> or <type>SimpleXMLElement</type> object to
+       The <classname>DOMDocument</classname> or <classname>SimpleXMLElement</classname> object to
        be transformed.
       </para>
      </listitem>

reference/xsl/xsltprocessor/transformtouri.xml

@@ -25,7 +25,7 @@
      <term><parameter>document</parameter></term>
      <listitem>
       <para>
-       The <type>DOMDocument</type> or <type>SimpleXMLElement</type> object to
+       The <classname>DOMDocument</classname> or <classname>SimpleXMLElement</classname> object to
        be transformed.
       </para>
      </listitem>

reference/xsl/xsltprocessor/transformtoxml.xml

@@ -24,7 +24,7 @@
      <term><parameter>document</parameter></term>
      <listitem>
       <para>
-       The <type>DOMDocument</type> or <type>SimpleXMLElement</type> object to
+       The <classname>DOMDocument</classname> or <classname>SimpleXMLElement</classname> object to
        be transformed.
       </para>
      </listitem>