add OS options to docs and change default OS to Ubuntu22.04

aws/README-zh.md

@@ -12,7 +12,7 @@
 > 
 > 比如 `m5a.large` 可能无法在 `ap-east-1` 区域部署（仅为假设）。在此情况下，你会在部署过程中遇到此错误：`The requested configuration is currently not supported. Please check the documentation for supported configurations`。新开放的 AWS 区域更容易出现此问题，因为它们提供的实例类型较少。如需了解更多关于实例可用性的信息，请参见 [https://ec2instances.info](https://ec2instances.info)。</details>
 
-- VPN 服务器的操作系统（Ubuntu 20.04, CentOS 7, Amazon Linux 2）
+- VPN 服务器的操作系统（Ubuntu 22.04/20.04, Debian 10/11/12, CentOS 7, Amazon Linux 2）
 - 你的 VPN 用户名
 - 你的 VPN 密码
 - 你的 VPN IPsec PSK（预共享密钥）

aws/README.md

@@ -12,7 +12,7 @@ Available customization parameters:
 > 
 > For example, you may not be able to deploy an `m5a.large` instance in `ap-east-1` (hypothetically). In that case, you might experience the following error during deployment: `The requested configuration is currently not supported. Please check the documentation for supported configurations`. Newly released regions are more prone to having this problem as there are less variety of instances. For more info about instance type availability, refer to [https://instances.vantage.sh/](https://instances.vantage.sh/).</details>
 
-- OS for your VPN server (Ubuntu 20.04, CentOS 7, Amazon Linux 2)
+- OS for your VPN server (Ubuntu 22.04/20.04, Debian 10/11/12, CentOS 7, Amazon Linux 2)
 - Your VPN username
 - Your VPN password
 - Your VPN IPsec PSK (pre-shared key)

aws/cloudformation-template-ipsec.json

@@ -501,8 +501,8 @@
         },
         "OS": {
             "Type": "String",
-            "Description": "The OS of your VPN server. Default: Ubuntu 20.04",
-            "Default": "Ubuntu2004",
+            "Description": "The OS of your VPN server. Default: Ubuntu 22.04",
+            "Default": "Ubuntu2204",
             "AllowedValues": [
                 "Ubuntu2004",
                 "Ubuntu2204",