tools: Fix broken link to documentation in NFD status web page

Change-Id: Ic47a1c2be6ccc185b9ff8b67c863a356a63746fe
Refs: #2405
diff --git a/tools/nfd-status-http-server-files/nfd-status.xsl b/tools/nfd-status-http-server-files/nfd-status.xsl
index 76c7004..d4fa89c 100644
--- a/tools/nfd-status-http-server-files/nfd-status.xsl
+++ b/tools/nfd-status-http-server-files/nfd-status.xsl
@@ -23,7 +23,7 @@
     <xsl:variable name="version">
       <xsl:apply-templates select="nfd:nfdStatus/nfd:generalStatus/nfd:version"/>
     </xsl:variable>
-    <span class="grey">Powered by </span><a target="_blank" href="http://named-data.net/doc/NFD/{$version}/"><span class="green">NFD version <xsl:value-of select="$version"/></span></a><span class="grey">.</span>
+    <span class="grey">Powered by </span><a target="_blank" href="http://named-data.net/doc/NFD/"><span class="green">NFD version <xsl:value-of select="$version"/></span></a><span class="grey">.</span>
   </footer>
   </body>
   </html>