docs: fix an improper git browsable address

Signed-off-by: NChen Hanxiao <chenhanxiao@cn.fujitsu.com>

docs/hacking.html.in

@@ -14,7 +14,7 @@
       <li>Official upstream repository is kept in git
         (<code>git://libvirt.org/libvirt.git</code>) and is browsable
         along with other libvirt-related repositories
-        (e.g. libvirt-python) <a href="http://libvirt.org">online</a>.</li>
+        (e.g. libvirt-python) <a href="http://libvirt.org/git/">online</a>.</li>
 
       <li><p>Post patches in unified diff format, with git rename
         detection enabled.  You need a one-time setup of:</p>