docs/page.xls: remove unnecessary namespace attribute

It breaks the build on RHEL-5.10 and because it's only optional we
could remove it from the code. The default namespace will be used.
This hunk was introduced by commit 237a088b.
Signed-off-by: NPavel Hrdina <phrdina@redhat.com>

docs/page.xsl

@@ -187,7 +187,7 @@
   </xsl:template>
 
   <xsl:template match="html:h2 | html:h3 | html:h4 | html:h5 | html:h6" mode="content">
-    <xsl:element name="{name()}" namespace="{namespace-uri()}">
+    <xsl:element name="{name()}">
       <xsl:apply-templates mode="copy" />
       <xsl:if test="./html:a/@name">
         <a class="headerlink" href="#{html:a/@name}" title="Permalink to this headline">&#xb6;</a>
@@ -200,7 +200,7 @@
   </xsl:template>
 
   <xsl:template match="node()" mode="copy">
-    <xsl:element name="{name()}" namespace="{namespace-uri()}">
+    <xsl:element name="{name()}">
       <xsl:copy-of select="./@*"/>
       <xsl:apply-templates mode="copy" />
     </xsl:element>