fix anchor target

tsa/howto/new-machine.mdwn

@@ -24,7 +24,7 @@ release, testing. Here are site-specific installs:
 * [[new-machine-hetzner-cloud]]
 * [[new-machine-hetzner-robot]]
 * for a new virtual machine in the [[ganeti]] cluster, follow
-  [[ganeti#Adding a new instance]]. new ganeti *nodes* (which host
+  [[ganeti#Adding_a_new_instance]]. new ganeti *nodes* (which host
   virtual machines) should be installed by following the other
   procedures here, then [[ganeti#New_node]]
 * linaro: [[openstack]]