Update README to check eth balance

testnet-nitro-node.md

@@ -56,6 +56,16 @@
   export ASSET_ADDRESS_1=$(jq -r --arg chainId "$GETH_CHAIN_ID" '.[$chainId][0].contracts.TestToken.address' assets.json)
   export ASSET_ADDRESS_2=$(jq -r --arg chainId "$GETH_CHAIN_ID" '.[$chainId][0].contracts.TestToken2.address' assets.json)
 
+  # Check balance of eth account
+  curl -X POST $GETH_CHAIN_URL \
+  -H "Content-Type: application/json" \
+  -d '{
+    "jsonrpc":"2.0",
+    "method":"eth_getBalance",
+    "params":["'"$ACCOUNT_ADDRESS"'", "latest"],
+    "id":1
+  }'
+
   # Check balance of first asset address
   curl -X POST $GETH_CHAIN_URL \
    -H "Content-Type: application/json" \
@@ -369,7 +379,7 @@ Perform payments using a virtual payment channel created with another Nitro node
   ```bash
   export BRIDGE_NITRO_ADDRESS=$(yq eval '.bridge_nitro_address' nitro-node-config.yml)
 
-  # Counterparty to create the payment channel with
+  # Obtain the Nitro address of the participant with whom you want to create payment channel with
   export COUNTER_PARTY_ADDRESS=<counterparty-nitro-address>
 
   # Mirrored channel on L2