Addressing some comments

Signed-off-by: Jono Finger <jfinger@plos.org>

guide/self_hosted_registry.md

@@ -1,4 +1,4 @@
-# Using a self-hosted registry with OpenFaaS
+# Use a self-hosted registry with OpenFaaS
 
 If you're using OpenFaaS on single host, then you don't need to push your images to a registry. They will just be used from the local Docker library.
 
@@ -10,6 +10,8 @@ This describes how to use OpenFaaS in a swarm with your own local registry for h
 
 For this example lets presume you want to create a swarm of 3 nodes. Use node1 as the manager.
 
+This is adapted from the [Swarm deployment guide](https://github.com/openfaas/faas/blob/master/guide/deployment_swarm.md).
+
 ```
 $ docker swarm init --advertise-addr $(hostname -i)
 ```
@@ -26,12 +28,13 @@ $ git clone https://github.com/openfaas/faas && \
   ./deploy_stack.sh
 ```
 
-## Add a registry to the swarm
+## Start a registry
+
+Add it to the swarm and use the same network as OpenFaaS.
 
 ```
 docker service create -d -p 5000:5000 \
   --network func_functions --detach=false \
-  --constraint 'node.role == manager' \
   --name registry registry:2
 ```
 
@@ -42,6 +45,13 @@ Here we are using a basic local registry. You can deploy it elsewhere and use vo
 
 This is a helper for using and deploying functions to OpenFaaS.
 
+On a Mac if you're using brew then you can type in
+```
+$ brew install faas-cli
+```
+
+On Linux
+
 ```
 $ curl -sSL https://cli.openfaas.com | sh
 ```