chore: Update README to Include Custom JSON-RPC Ports Usage (#287)

Co-authored-by: Michael Tsitrin <michael@dymension.xyz>

scripts/setup_local.sh

@@ -68,8 +68,8 @@ sed -i'' -e "/\[p2p\]/,+3 s/laddr *= .*/laddr = \"tcp:\/\/$P2P_ADDRESS\"/" "$TEN
 
 sed -i'' -e "/\[grpc\]/,+6 s/address *= .*/address = \"$GRPC_ADDRESS\"/" "$APP_CONFIG_FILE"
 sed -i'' -e "/\[grpc-web\]/,+7 s/address *= .*/address = \"$GRPC_WEB_ADDRESS\"/" "$APP_CONFIG_FILE"
-sed -i'' -e "/\[[json-rpc]\]/,+6 s/address *= .*/address = \"$JSONRPC_ADDRESS\"/" "$APP_CONFIG_FILE"
-sed -i'' -e "/\[[json-rpc]\]/,+9 s/address *= .*/address = \"$JSONRPC_WS_ADDRESS\"/" "$APP_CONFIG_FILE"
+sed -i'' -e "/\[json-rpc\]/,+6 s/address *= .*/address = \"$JSONRPC_ADDRESS\"/" "$APP_CONFIG_FILE"
+sed -i'' -e "/\[json-rpc\]/,+9 s/address *= .*/address = \"$JSONRPC_WS_ADDRESS\"/" "$APP_CONFIG_FILE"
 sed -i'' -e '/\[api\]/,+3 s/enable *= .*/enable = true/' "$APP_CONFIG_FILE"
 sed -i'' -e "/\[api\]/,+9 s/address *= .*/address = \"tcp:\/\/$API_ADDRESS\"/" "$APP_CONFIG_FILE"