Replace 'five VMs' with 'a cluster of VMs'

slides/common/prereqs.md

@@ -86,15 +86,15 @@ class: in-person
 
 class: in-person, pic
 
-![You get five VMs](images/you-get-five-vms.jpg)
+![You get a cluster](images/you-get-a-cluster.jpg)
 
 ---
 
 class: in-person
 
-## You get five VMs
+## You get a cluster of cloud VMs
 
-- Each person gets 5 private VMs (not shared with anybody else)
+- Each person gets a private cluster of cloud VMs (not shared with anybody else)
 
 - They'll remain up for the duration of the workshop
 

slides/swarm/operatingswarm.md

@@ -10,7 +10,7 @@ Otherwise: check [part 1](#part-1) to learn how to set up your own cluster.
 
 We pick up exactly where we left you, so we assume that you have:
 
-- a five nodes Swarm cluster,
+- a Swarm cluster with at least 3 nodes,
 
 - a self-hosted registry,