clear up swarm sizes and manager+worker setups

Lot's of people will have ~5-10 servers, so let's give them more detailed info.

slides/swarm/morenodes.md

@@ -154,12 +154,14 @@ class: self-paced
   try to break them down in multiple clusters
   (keeping internal latency low)
 
-- Groups of up to 9 nodes: all of them are managers
+- Groups of 3 or 5 nodes: all of them are managers. Beyond 5, seperate out managers and workers.
 
-- Groups of 10 nodes and up: pick 5 "stable" nodes to be managers
+- Groups of 5-10 nodes: pick 3 "stable" nodes to be managers
   <br/>
   (Cloud pro-tip: use separate auto-scaling groups for managers and workers)
 
+- Groups of 10-100 nodes: pick 5 "stable" nodes to be managers
+
 - Groups of more than 100 nodes: watch your managers' CPU and RAM
 
 - Groups of more than 1000 nodes:
@@ -181,11 +183,11 @@ class: self-paced
 
 - Testing by the community: [4700 heterogeneous nodes all over the 'net](https://sematext.com/blog/2016/11/14/docker-swarm-lessons-from-swarm3k/)
 
-  - it just works
+  - it just works, assuming they have the resources
 
-  - more nodes require more CPU; more containers require more RAM
+  - more nodes require more manager CPU and Networking; more containers require more RAM
 
-  - scheduling of large jobs (70000 containers) is slow, though (working on it!)
+  - scheduling of large jobs (70,000 containers) is slow, though (working on it!)
 
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