doc/comedilib_html_config.xsl: Set function.parens to "1".

This makes sure the HTML output for
<function>foo<parameter>bar</parameter><parameter>baz</parameter></function>
includes parentheses, although it doesn't seem to add empty parentheses
after a plain <function>foo</function> which perhaps it should.

doc/comedilib_html_config.xsl

@@ -7,4 +7,5 @@
 	<xsl:param name="generate.section.toc.level" select="4"/>
 	<xsl:param name="html.stylesheet">comedilib.css</xsl:param>
 	<xsl:param name="funcsynopsis.style">ansi</xsl:param>
+	<xsl:param name="function.parens" select="1"/>
 </xsl:stylesheet>