Added requirement to enable JSON-RPC (#1365)

Signed-off-by: Adrian Sutton <adrian.sutton@consensys.net>

docs/Permissions/Onchain-Permissioning.md

@@ -54,13 +54,15 @@ in the [`permissioning-smart-contracts` repository](https://github.com/PegaSysEn
     
 ## Onchain Permissioning Setup
    
-1. Start your Pantheon node with contract permissioning options: 
+1. Start your Pantheon node including command line options: 
 
     * [--permissions-nodes-contract-enabled](../Reference/Pantheon-CLI-Syntax.md#permissions-nodes-contract-enabled)
       to enable onchain permissioning
 
     * [--permissions-nodes-contract-address](../Reference/Pantheon-CLI-Syntax.md#permissions-nodes-contract-address)
       set to the address of the Ingress contract in the genesis file (`"0x0000000000000000000000000000000000009999"`)
+      
+    * [--rpc-http-enabled](../Reference/Pantheon-CLI-Syntax.md#rpc-http-enabled) to enable JSON-RPC
 
 1. Create the following environment variables and set to the specified values: 
 
@@ -165,7 +167,7 @@ For participating nodes that are not going to add or remove nodes from the white
      set to the address of the Ingress contract in the genesis file (`"0x0000000000000000000000000000000000009999"`)
 
     * [--bootnodes](../Reference/Pantheon-CLI-Syntax.md#bootnodes) set to the first node (that is, the node that [deployed
-     the Admin and Rules contracts](#deploy-admin-and-rules-contracts). 
+     the Admin and Rules contracts](#deploy-admin-and-rules-contracts).      
 
 1. Copy the [enode URL](../Configuring-Pantheon/Node-Keys.md#enode-url) and [have node added to the whitelist](#add-and-remove-nodes-from-the-whitelist).