Update docs

README-ja.md

@@ -304,7 +304,7 @@ sudo VPN_PROTECT_CONFIG=yes sh vpn.sh
 
 *他の言語で読む：[English](README.md#next-steps)、[中文](README-zh.md#下一步)、[日本語](README-ja.md#次のステップ)。*
 
-コンピュータやデバイスをVPNに接続します。以下を参照してください：
+コンピュータやデバイスをVPNに接続します。詳細は以下のリンク（英語）をご覧ください。
 
 **[IKEv2 VPNクライアントの設定（推奨）](docs/ikev2-howto.md)**
 
@@ -365,7 +365,7 @@ https://gitlab.com/hwdsl2/setup-ipsec-vpn/-/raw/master/extras/vpnupgrade.sh
 
 ## VPNユーザーの管理
 
-[VPNユーザーの管理](docs/manage-users.md)を参照してください。
+[VPNユーザーの管理](docs/manage-users.md)（英語）を参照してください。
 
 - [ヘルパースクリプトを使用してVPNユーザーを管理する](docs/manage-users.md#manage-vpn-users-using-helper-scripts)
 - [VPNユーザーを表示する](docs/manage-users.md#view-vpn-users)
@@ -374,7 +374,7 @@ https://gitlab.com/hwdsl2/setup-ipsec-vpn/-/raw/master/extras/vpnupgrade.sh
 
 ## 高度な使用法
 
-[高度な使用法](docs/advanced-usage.md)を参照してください。
+[高度な使用法](docs/advanced-usage.md)（英語）を参照してください。
 
 - [代替DNSサーバーの使用](docs/advanced-usage.md#use-alternative-dns-servers)
 - [DNS名とサーバーIPの変更](docs/advanced-usage.md#dns-name-and-server-ip-changes)

docs/vpn-book-zh.md

@@ -2,11 +2,11 @@
 
 # 搭建自己的 VPN 服务器分步指南
 
-本书是搭建你自己的 IPsec VPN, OpenVPN 和 WireGuard 服务器的分步指南。提供电子书和平装书格式。
+本书是搭建你自己的 IPsec VPN, OpenVPN 和 WireGuard 服务器的分步指南。在 Amazon、Google Play 和 Apple Books 上提供电子书、有声读物和平装本格式。
 
 本书有以下语言版本：[简体中文](https://books2read.com/vpnguidezh), [繁體中文](https://books2read.com/vpnguidezht), [English](https://books2read.com/vpnguide?store=amazon), [Español](https://books2read.com/vpnguidees?store=amazon), [Deutsch](https://books2read.com/vpnguidede?store=amazon), [Français](https://books2read.com/vpnguidefr?store=amazon), [Italiano](https://books2read.com/vpnguideit?store=amazon), [Nederlands](https://books2read.com/vpnguidenl?store=amazon), [Português](https://books2read.com/vpnguidept?store=amazon), [日本語](https://books2read.com/vpnguideja?store=amazon).
 
-你还可以在同一系列书籍中找到有关搭建你自己的 VPN 服务器的综合/完整指南。有以下语言版本：[简体中文](https://books2read.com/vpnzh), [繁體中文](https://books2read.com/vpnzht), [English](https://books2read.com/vpn), [Español](https://books2read.com/vpnes), [Deutsch](https://books2read.com/vpnde), [Français](https://books2read.com/vpnfr), [Italiano](https://books2read.com/vpnit), [日本語](https://books2read.com/vpnja?store=amazon).
+你还可以在同一系列书籍中找到有关搭建 VPN 服务器的综合/完整指南。有以下语言版本：[简体中文](https://books2read.com/vpnzh), [繁體中文](https://books2read.com/vpnzht), [English](https://books2read.com/vpn?store=amazon), [Español](https://books2read.com/vpnes?store=amazon), [Deutsch](https://books2read.com/vpnde?store=amazon), [Français](https://books2read.com/vpnfr?store=amazon), [Italiano](https://books2read.com/vpnit?store=amazon), [日本語](https://books2read.com/vpnja?store=amazon).
 
 作者页面：https://amazon.com/author/linsong
 

docs/vpn-book.md

@@ -2,11 +2,11 @@
 
 # Build Your Own VPN Server: A Step by Step Guide
 
-This book is a step-by-step guide to building your own IPsec VPN, OpenVPN and WireGuard server. Available in eBook, audiobook and paperback formats.
+This book is a step-by-step guide to building your own IPsec VPN, OpenVPN and WireGuard server. Available on Amazon, Google Play and Apple Books in eBook, audiobook and paperback formats.
 
 This book is available in: [English](https://books2read.com/vpnguide?store=amazon), [简体中文](https://books2read.com/vpnguidezh), [繁體中文](https://books2read.com/vpnguidezht), [Español](https://books2read.com/vpnguidees?store=amazon), [Deutsch](https://books2read.com/vpnguidede?store=amazon), [Français](https://books2read.com/vpnguidefr?store=amazon), [Italiano](https://books2read.com/vpnguideit?store=amazon), [Nederlands](https://books2read.com/vpnguidenl?store=amazon), [Português](https://books2read.com/vpnguidept?store=amazon), [日本語](https://books2read.com/vpnguideja?store=amazon).
 
-Also available: A comprehensive/complete guide to building your own VPN server, which you can find in the same book series. Available in: [English](https://books2read.com/vpn), [简体中文](https://books2read.com/vpnzh), [繁體中文](https://books2read.com/vpnzht), [Español](https://books2read.com/vpnes), [Deutsch](https://books2read.com/vpnde), [Français](https://books2read.com/vpnfr), [Italiano](https://books2read.com/vpnit), [日本語](https://books2read.com/vpnja?store=amazon).
+Also available: A comprehensive/complete guide to building a VPN server, which you can find in the same book series. Available in: [English](https://books2read.com/vpn?store=amazon), [简体中文](https://books2read.com/vpnzh), [繁體中文](https://books2read.com/vpnzht), [Español](https://books2read.com/vpnes?store=amazon), [Deutsch](https://books2read.com/vpnde?store=amazon), [Français](https://books2read.com/vpnfr?store=amazon), [Italiano](https://books2read.com/vpnit?store=amazon), [日本語](https://books2read.com/vpnja?store=amazon).
 
 Author page: https://amazon.com/author/linsong