IRC channel update.

doc/_templates/indexsidebar.html

@@ -27,6 +27,6 @@ are also available.{%endtrans%}</p>
          onfocus="$(this).val('');"/>
   <input type="submit" name="sub" value="Subscribe" style="font-size: 90%; width: 70px"/>
 </form>
-<p>{%trans%}or come to the <tt>#pocoo</tt> channel on FreeNode.{%endtrans%}</p>
+<p>{%trans%}or come to the <tt>#sphinx-doc</tt> channel on FreeNode.{%endtrans%}</p>
 <p>{%trans%}You can also open an issue at the
   <a href="http://www.bitbucket.org/birkenfeld/sphinx/issues/">tracker</a>.{%endtrans%}</p>