docs: Add PlatON to the protocol list
Fix .
@@ -158,7 +158,7 @@ real node of an Ethereum compatible blockchain network must be available.
$chmod a+x ./build/demo/demo_<protocol>/<demo_name>
$./build/demo/demo_<protocol>/<demo_name>
```
-<protocol> can be `ethereum` `fiscobcos` `platone` `fabric`.
+\<protocol\> can be `ethereum` `fiscobcos` `platone` `fabric` `platon`.
Make sure the network connection to the blockchain node (or blockchain simulator) is available.
