follow fabric jobs renames

howto/new-machine.md

@@ -295,7 +295,7 @@ above](#pre-requisites)! Some installers cover all of those steps, but most do n
         reboot
 
  8. if the machine was *not* installed from the Fabric installer (the
-    `host.install-hetzner-robot` task), schedule a silence for backup
+    `install.hetzner-robot` task), schedule a silence for backup
     alerts with:
      
         fab silence.create \

howto/rename-a-host.md

@@ -18,7 +18,7 @@ node's classification yaml should be removed from
 
 Revoke its certificates from the Puppet server using the retirement script:
 
-    retire -H foo.torproject.org revoke-puppet
+    fab -H foo.torproject.org retire.revoke-puppet
 
 ## Change the hostname
 
@@ -82,7 +82,7 @@ generated in this step.
 
 This will schedule the removal of backups under the old hostname:
 
-    retire -H foo.torproject.org remove-backups
+    fab -H foo.torproject.org retire.remove-backups
 
 ## Adjust documentation