add instruction to update authrpc.port in priv-netwk

docs/fundamentals/private-network.md

@@ -327,10 +327,10 @@ We recommend using a regular node as bootstrap node for production deployments.
 INFO [05-13|15:50:03.645] New local node record                    seq=1,652,453,403,645 id=a2d37f4a7d515b3a ip=nil udp=0 tcp=0
 ```
 
-The two nodes can now be started. Open separate terminals for each node, leaving the bootnode running in the original terminal. In each terminal, run the following command (replacing `node1` with `node2` where appropriate, and giving each node a different port ID. The account address and password file for node 1 must also be provided:
+The two nodes can now be started. Open separate terminals for each node, leaving the bootnode running in the original terminal. In each terminal, run the following command (replacing `node1` with `node2` where appropriate, and giving each node different `--port` and `authrpc.port` IDs. The account address and password file for node 1 must also be provided:
 
 ```sh
-./geth --datadir node1 --port 30306 --bootnodes enode://f7aba85ba369923bffd3438b4c8fde6b1f02b1c23ea0aac825ed7eac38e6230e5cadcf868e73b0e28710f4c9f685ca71a86a4911461637ae9ab2bd852939b77f@127.0.0.1:0?discport=30305  --networkid 123454321 --unlock 0xC1B2c0dFD381e6aC08f34816172d6343Decbb12b --password node1/password.txt
+./geth --datadir node1 --port 30306 --bootnodes enode://f7aba85ba369923bffd3438b4c8fde6b1f02b1c23ea0aac825ed7eac38e6230e5cadcf868e73b0e28710f4c9f685ca71a86a4911461637ae9ab2bd852939b77f@127.0.0.1:0?discport=30305  --networkid 123454321 --unlock 0xC1B2c0dFD381e6aC08f34816172d6343Decbb12b --password node1/password.txt --authrpc.port 8551
 ```
 
 This will start the node using the bootnode as an entry point. Repeat the same command with the information appropriate to node 2. In each terminal, the following logs indicate success: