Updated doc to specify bootnodes using --bootnodes with no arguments (#560)

* Updated for --bootnodes option to take no arguments


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

docs/Configuring-Pantheon/Testing-Developing-Nodes.md

@@ -30,13 +30,13 @@ To start a bootnode for a private network:
     
 2. Start the bootnode, specifying:
 
-    * Empty string for the [`--bootnodes`](../Reference/Pantheon-CLI-Syntax.md#bootnodes) option because this is the bootnode. 
+    * No arguments for the [`--bootnodes` option](../Reference/Pantheon-CLI-Syntax.md#bootnodes) because this is the bootnode. 
     * Network ID for your private network.
     * Genesis file and data directory as in the previous step. 
     
     !!! example
         ```
-        pantheon --bootnodes="" --genesis=privateNetworkGenesis.json --datadir=nodeDataDir --network-id 123 
+        pantheon --bootnodes --genesis=privateNetworkGenesis.json --datadir=nodeDataDir --network-id 123 
          ```
      
 To specify this bootnode for another node, the enode URL for the `--bootnodes` option is `enode://<id>@<host:port>` where:

docs/Getting-Started/Starting-Pantheon.md

@@ -67,14 +67,13 @@ call [JSON-RPC API methods](../Reference/JSON-RPC-API-Methods.md) to confirm the
 To run a node that mines blocks at a rate suitable for testing purposes: 
 
 ```bash
-pantheon --dev-mode --network-id="2018" --bootnodes= --miner-enabled --miner-coinbase=0xfe3b557e8fb62b89f4916b721be55ceb828dbd73 --rpc-cors-origins="all" --ws-enabled --rpc-enabled --datadir=/tmp/tmpDatdir
+pantheon --dev-mode --network-id="2018" --bootnodes --miner-enabled --miner-coinbase=0xfe3b557e8fb62b89f4916b721be55ceb828dbd73 --rpc-cors-origins="all" --ws-enabled --rpc-enabled --datadir=/tmp/tmpDatdir
 ```
 
-Alternatively, use the following [configuration file](../Configuring-Pantheon/) to start a node with the same options as the above command line: 
+Alternatively, use the following [configuration file](../Configuring-Pantheon/Using-Configuration-File.md) and `--bootnodes` on the command line to start a node with the same options as above: 
 ```toml
 dev-mode=true
 network-id="2018"
-bootnodes=[]
 miner-enabled=true
 miner-coinbase="0xfe3b557e8fb62b89f4916b721be55ceb828dbd73"
 rpc-cors-origins="all"
@@ -137,4 +136,4 @@ To run a node on mainnet with the HTTP JSON-RPC service enabled:
 
 ```bash
 pantheon --rpc-enabled
-```
+```

docs/Reference/Pantheon-CLI-Syntax.md

@@ -58,7 +58,7 @@ List of node IDs with which this node will not peer. The node ID is the public k
 ### bootnodes
 
 ```bash tab="Syntax"
---bootnodes=<enode://id@host:port>[,<enode://id@host:port>...]...
+--bootnodes[=<enode://id@host:port>[,<enode://id@host:port>...]...]
 ```
 
 ```bash tab="Example Command Line"
@@ -69,11 +69,19 @@ List of node IDs with which this node will not peer. The node ID is the public k
 bootnodes=["enode://c35c3...d615f@1.2.3.4:30303","enode://f42c13...fc456@1.2.3.5:30303"]
 ```
   
+```bash tab="Example Node Acting as Bootnode"
+--bootnodes
+```  
+  
 List of comma-separated enode URLs for P2P discovery bootstrap. 
   
 When connecting to mainnet or public testnets, the default is a predefined list of enode URLs. 
 Specify bootnodes when connecting to a [private network](../Configuring-Pantheon/Testing-Developing-Nodes.md#bootnodes).
 
+!!! note
+    Specifying a node is a [bootnode](../Configuring-Pantheon/Testing-Developing-Nodes.md#bootnodes) 
+    must be done on the command line not in a [configuration file](../Configuring-Pantheon/Using-Configuration-File.md).  
+
 ### config
 
 ```bash tab="Syntax"

docs/Tutorials/Create-Private-Network.md

@@ -132,17 +132,17 @@ The `database` directory is created when the node is started and contains the bl
 
 Restart Node-1 specifying:
 
-* An empty string for the [`--bootnodes` option](../Reference/Pantheon-CLI-Syntax.md#bootnodes) because this is your bootnode.
+* No arguments for the [`--bootnodes` option](../Reference/Pantheon-CLI-Syntax.md#bootnodes) because this is your bootnode.
 * Mining is enabled and the account to which mining rewards are paid using the [`--miner-enabled`](../Reference/Pantheon-CLI-Syntax.md#miner-enabled) 
 and [`--miner-coinbase` options](../Reference/Pantheon-CLI-Syntax.md#miner-coinbase).
 * JSON-RPC API is enabled using the [`--rpc-enabled` option](../Reference/Pantheon-CLI-Syntax.md#rpc-enabled). 
 
 ```bash tab="MacOS"
-pantheon --datadir=Node-1-Datadir --genesis=../privateNetworkGenesis.json --bootnodes="" --network-id 123 --miner-enabled --miner-coinbase fe3b557e8fb62b89f4916b721be55ceb828dbd73 --rpc-enabled      
+pantheon --datadir=Node-1-Datadir --genesis=../privateNetworkGenesis.json --bootnodes --network-id 123 --miner-enabled --miner-coinbase fe3b557e8fb62b89f4916b721be55ceb828dbd73 --rpc-enabled      
 ```
 
 ```bash tab="Windows"
-pantheon --datadir=Node-1-Datadir --genesis=..\privateNetworkGenesis.json --bootnodes="" --network-id 123 --miner-enabled --miner-coinbase fe3b557e8fb62b89f4916b721be55ceb828dbd73 --rpc-enabled      
+pantheon --datadir=Node-1-Datadir --genesis=..\privateNetworkGenesis.json --bootnodes --network-id 123 --miner-enabled --miner-coinbase fe3b557e8fb62b89f4916b721be55ceb828dbd73 --rpc-enabled      
 ```
 
 !!! info