docs: update commands usage

Author: y-young

README.md

@@ -84,22 +84,15 @@ For more information, see [Documentation](https://nazurin.readthedocs.io/getting
 
 ## Usage
 
-Commands:
-
-- `/ping` - pong
-- `/pixiv <id>` - view pixiv artwork
-- `/pixiv_download <id>` - download pixiv artwork
-- `/danbooru <id>` - view danbooru post
-- `/danbooru_download <id>` - download danbooru post
-- `/yandere <id>` - view yandere post
-- `/yandere_download <id>` - download yandere post
-- `/konachan <id>` - view konachan post
-- `/konachan_download <id>` - download konachan post
-- `/zerochan <id>` - view zerochan post
-- `/zerochan_download <id>` - download zerochan post
-- `/bookmark <id>` - bookmark pixiv artwork
-- `/clear_cache` - clear download cache
-- `/help` - get help text
+Use `/help` command to get a list of available commands or help for a specific command, use `/set_commands` to set bot commands in command menu.
+
+Some system commands are listed below:
+
+- `/clear_cache` — Clear cache
+- `/help [COMMAND]` — Get help of all commands or a specific command
+- `/ping` — Pong
+- `/set_commands` — Set commands
+- `/start` — Get help
 
 ### How to update your collection
 

docs/getting-started/usage.md

@@ -2,20 +2,17 @@
 
 ## Telegram Commands
 
-- `/ping` - pong
-- `/pixiv <id>` - view pixiv artwork
-- `/pixiv_download <id>` - download pixiv artwork
-- `/danbooru <id>` - view danbooru post
-- `/danbooru_download <id>` - download danbooru post
-- `/yandere <id>` - view yandere post
-- `/yandere_download <id>` - download yandere post
-- `/konachan <id>` - view konachan post
-- `/konachan_download <id>` - download konachan post
-- `/zerochan <id>` - view zerochan post
-- `/zerochan_download <id>` - download zerochan post
-- `/bookmark <id>` - bookmark pixiv artwork
-- `/clear_cache` - clear cache
-- `/help` - get help text
+Use `/help` command to get a list of available commands or help for a specific command, use `/set_commands` to set bot commands in command menu.
+
+Some system commands are listed below:
+
+- `/clear_cache` — Clear cache
+- `/help [COMMAND]` — Get help of all commands or a specific command
+- `/ping` — Pong
+- `/set_commands` — Set commands
+- `/start` — Get help
+
+_Added in v2.5.0._
 
 ## Collect Images
 

docs/getting-started/usage.zh.md

@@ -2,20 +2,17 @@
 
 ## Telegram 命令
 
-- `/ping` - pong
-- `/pixiv <id>` - 浏览 Pixiv 作品
-- `/pixiv_download <id>` - 下载 Pixiv 作品
-- `/danbooru <id>` - 浏览 Danbooru 图片
-- `/danbooru_download <id>` - 下载 Danbooru 图片
-- `/yandere <id>` - 浏览 yandere 图片
-- `/yandere_download <id>` - 下载 yandere 图片
-- `/konachan <id>` - 浏览 konachan 图片
-- `/konachan_download <id>` - 下载 konachan 图片
-- `/zerochan <id>` - 浏览 Zerochan 图片
-- `/zerochan_download <id>` - 下载 Zerochan 图片
-- `/bookmark <id>` - 收藏 Pixiv 作品
-- `/clear_cache` - 清除缓存
-- `/help` - 获取帮助
+使用 `/help` 命令获取所有可用命令的列表或某个具体命令的帮助，使用 `/set_commands` 在菜单中设置命令。
+
+一些系统命令如下：
+
+- `/clear_cache` — 清除缓存
+- `/help [COMMAND]` — 获取所有命令或某个命令的帮助
+- `/ping` — Pong
+- `/set_commands` — 设置命令
+- `/start` — 获取帮助
+
+_在 v2.5.0 中新增。_
 
 ## 收集图片