update default bitcoin node in sample configs (#1700)

Author: wileyj

reference/sample-configuration-files.md

@@ -216,11 +216,7 @@ stacker = true
 [burnchain]
 chain = "bitcoin"
 mode = "mainnet"
-peer_host = "bitcoind.stacks.co"
-username = "blockstack"
-password = "blockstacksystem"
-rpc_port = 8332
-peer_port = 8333
+peer_host = "bitcoin.mainnet.stacks.org"
 
 # Set your auth token, which the signer uses
 # This should match the auth_password field of your signer config

reference/stacks-node-configuration.md

@@ -140,9 +140,6 @@ bootstrap_node = "02196f005965cebe6ddc3901b7b1cc1aa7a88f305bb8c5893456b8f9a60592
 chain = "bitcoin"
 mode = "mainnet"
 peer_host = "localhost"
-username = "user"
-password = "pass"
-rpc_port = 8332
 peer_port = 8333
 
 [[events_observer]]