新增22.04版本

Author: WeiLoy

docs/成为主网验证节点.md

@@ -68,13 +68,20 @@ sudo wget https://download.platon.network/platon/platon/1.4.4/platon -O /usr/bin
 sudo wget https://download.platon.network/platon/platon/1.4.2/platonkey -O /usr/bin/platonkey
 ```
 
-Ubuntu 20.04 or higher：
+Ubuntu 20.04：
 
 ```bash
 sudo wget https://download.platon.network/platon/platon/ubuntu20.04/1.4.4/platon -O /usr/bin/platon
 sudo wget https://download.platon.network/platon/platon/ubuntu20.04/1.4.2/platonkey -O /usr/bin/platonkey
 ```
 
+Ubuntu 22.04：
+
+```bash
+sudo wget https://download.platon.network/platon/platon/ubuntu22.04/1.4.4/platon -O /usr/bin/platon
+sudo wget https://download.platon.network/platon/platon/ubuntu22.04/1.4.2/platonkey -O /usr/bin/platonkey
+```
+
 ```bash
 sudo chmod +x /usr/bin/platon  /usr/bin/platonkey
 platon version