Added AWS to install cloud setup (#392)

Add AWS instructions to setup commands, since AWS only provides service hostname, not IP.

Documentation/docs-site/content/install.md

@@ -6,7 +6,7 @@ draft: false
 
 Welcome! This guide will get you up and running with Fission on a
 Kubernetes cluster.
-           
+
 ### Cluster preliminaries
 
 If you don't have a Kubernetes cluster, [here's a quick guide to set
@@ -149,6 +149,13 @@ FISSION_URL and FISSION_ROUTER, respectively.  Wait for services to
 get IP addresses (check this with ```kubectl --namespace fission get
 svc```).  Then:
 
+##### AWS
+```
+  $ export FISSION_URL=http://$(kubectl --namespace fission get svc controller -o=jsonpath='{..hostname}')
+  $ export FISSION_ROUTER=$(kubectl --namespace fission get svc router -o=jsonpath='{..hostname}')
+```
+
+##### GCP
 ```
   $ export FISSION_URL=http://$(kubectl --namespace fission get svc controller -o=jsonpath='{..ip}')
   $ export FISSION_ROUTER=$(kubectl --namespace fission get svc router -o=jsonpath='{..ip}')