Update docs for versions (go-gitea#20750)

Author: wxiaoguang

custom/conf/app.example.ini

@@ -1503,6 +1503,11 @@ ROUTER = console
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;
+;; NOTICE: this section is for Gitea 1.18 and later. If you are using Gitea 1.17 or older,
+;; please refer to
+;; https://github.com/go-gitea/gitea/blob/release/v1.17/custom/conf/app.example.ini
+;; https://github.com/go-gitea/gitea/blob/release/v1.17/docs/content/doc/advanced/config-cheat-sheet.en-us.md
+;;
 ;ENABLED = false
 ;;
 ;; Buffer length of channel, keep it as it is if you don't know what it is.
@@ -1516,12 +1521,12 @@ ROUTER = console
 ;; - dummy: send email messages to the log as a testing phase.
 ;; If your provider does not explicitly say which protocol it uses but does provide a port,
 ;; you can set SMTP_PORT instead and this will be inferred.
-;; (Before 1.18, this was controlled via MAILER_TYPE and IS_TLS_ENABLED.)
+;; (Before 1.18, see the notice, this was controlled via MAILER_TYPE and IS_TLS_ENABLED.)
 ;PROTOCOL =
 ;;
 ;; Mail server address, e.g. smtp.gmail.com.
 ;; For smtp+unix, this should be a path to a unix socket instead.
-;; (Before 1.18, this was combined with SMTP_PORT as HOST.)
+;; (Before 1.18, see the notice, this was combined with SMTP_PORT as HOST.)
 ;SMTP_ADDR =
 ;;
 ;; Mail server port. Common ports are:

docs/content/doc/advanced/config-cheat-sheet.en-us.md

@@ -296,8 +296,8 @@ The following configuration set `Content-Type: application/vnd.android.package-a
 - `MINIMUM_KEY_SIZE_CHECK`: **true**: Indicate whether to check minimum key size with corresponding type.
 
 - `OFFLINE_MODE`: **false**: Disables use of CDN for static files and Gravatar for profile pictures.
-- `CERT_FILE`: **https/cert.pem**: Cert file path used for HTTPS. When chaining, the server certificate must come first, then intermediate CA certificates (if any). This is ignored if `ENABLE_ACME=true`. From 1.11 paths are relative to `CUSTOM_PATH`.
-- `KEY_FILE`: **https/key.pem**: Key file path used for HTTPS. This is ignored if `ENABLE_ACME=true`. From 1.11 paths are relative to `CUSTOM_PATH`.
+- `CERT_FILE`: **https/cert.pem**: Cert file path used for HTTPS. When chaining, the server certificate must come first, then intermediate CA certificates (if any). This is ignored if `ENABLE_ACME=true`. Paths are relative to `CUSTOM_PATH`.
+- `KEY_FILE`: **https/key.pem**: Key file path used for HTTPS. This is ignored if `ENABLE_ACME=true`. Paths are relative to `CUSTOM_PATH`.
 - `STATIC_ROOT_PATH`: **./**: Upper level of template and static files path.
 - `APP_DATA_PATH`: **data** (**/data/gitea** on docker): Default path for application data.
 - `STATIC_CACHE_TIME`: **6h**: Web browser cache time for static resources on `custom/`, `public/` and all uploaded avatars. Note that this cache is disabled when `RUN_MODE` is "dev".
@@ -438,11 +438,11 @@ Configuration at `[queue]` will set defaults for queues with overrides for indiv
 - `MAX_ATTEMPTS`: **10**: Maximum number of attempts to create the wrapped queue
 - `TIMEOUT`: **GRACEFUL_HAMMER_TIME + 30s**: Timeout the creation of the wrapped queue if it takes longer than this to create.
 - Queues by default come with a dynamically scaling worker pool. The following settings configure this:
-- `WORKERS`: **0** (v1.14 and before: **1**): Number of initial workers for the queue.
+- `WORKERS`: **0**: Number of initial workers for the queue.
 - `MAX_WORKERS`: **10**: Maximum number of worker go-routines for the queue.
 - `BLOCK_TIMEOUT`: **1s**: If the queue blocks for this time, boost the number of workers - the `BLOCK_TIMEOUT` will then be doubled before boosting again whilst the boost is ongoing.
 - `BOOST_TIMEOUT`: **5m**: Boost workers will timeout after this long.
-- `BOOST_WORKERS`: **1** (v1.14 and before: **5**): This many workers will be added to the worker pool if there is a boost.
+- `BOOST_WORKERS`: **1**: This many workers will be added to the worker pool if there is a boost.
 
 Gitea creates the following non-unique queues:
 
@@ -634,7 +634,7 @@ Define allowed algorithms and their minimum key length (use -1 to disable a type
 
 - `QUEUE_LENGTH`: **1000**: Hook task queue length. Use caution when editing this value.
 - `DELIVER_TIMEOUT`: **5**: Delivery timeout (sec) for shooting webhooks.
-- `ALLOWED_HOST_LIST`: **external**: Since 1.15.7. Default to `*` for 1.15.x, `external` for 1.16 and later. Webhook can only call allowed hosts for security reasons. Comma separated list.
+- `ALLOWED_HOST_LIST`: **external**: Webhook can only call allowed hosts for security reasons. Comma separated list.
   - Built-in networks:
     - `loopback`: 127.0.0.0/8 for IPv4 and ::1/128 for IPv6, localhost is included.
     - `private`: RFC 1918 (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) and RFC 4193 (FC00::/7). Also called LAN/Intranet.
@@ -649,6 +649,12 @@ Define allowed algorithms and their minimum key length (use -1 to disable a type
 
 ## Mailer (`mailer`)
 
+⚠️ This section is for Gitea 1.18 and later. If you are using Gitea 1.17 or older,
+please refer to
+[Gitea 1.17 app.ini example](https://github.com/go-gitea/gitea/blob/release/v1.17/custom/conf/app.example.ini)
+and
+[Gitea 1.17 configuration document](https://github.com/go-gitea/gitea/blob/release/v1.17/docs/content/doc/advanced/config-cheat-sheet.en-us.md)
+
 - `ENABLED`: **false**: Enable to use a mail service.
 - `PROTOCOL`: **\<empty\>**: Mail server protocol. One of "smtp", "smtps", "smtp+startls", "smtp+unix", "sendmail", "dummy". _Before 1.18, this was inferred from a combination of `MAILER_TYPE` and `IS_TLS_ENABLED`._
   - SMTP family, if your provider does not explicitly say which protocol it uses but does provide a port, you can set SMTP_PORT instead and this will be inferred.

docs/content/doc/advanced/config-cheat-sheet.zh-cn.md

@@ -15,7 +15,14 @@ menu:
 
 # 配置说明
 
-这是针对Gitea配置文件的说明，你可以了解Gitea的强大配置。需要说明的是，你的所有改变请修改 `custom/conf/app.ini` 文件而不是源文件。所有默认值可以通过 [app.example.ini](https://github.com/go-gitea/gitea/blob/master/custom/conf/app.example.ini) 查看到。如果你发现 `%(X)s` 这样的内容，请查看 [ini](https://github.com/go-ini/ini/#recursive-values) 这里的说明。标注了 :exclamation: 的配置项表明除非你真的理解这个配置项的意义，否则最好使用默认值。
+这是针对Gitea配置文件的说明，你可以了解Gitea的强大配置。需要说明的是，你的所有改变请修改 `custom/conf/app.ini` 文件而不是源文件。
+所有默认值可以通过 [app.example.ini](https://github.com/go-gitea/gitea/blob/master/custom/conf/app.example.ini) 查看到。
+如果你发现 `%(X)s` 这样的内容，请查看 [ini](https://github.com/go-ini/ini/#recursive-values) 这里的说明。
+标注了 :exclamation: 的配置项表明除非你真的理解这个配置项的意义，否则最好使用默认值。
+
+## ⚠️时效性警告⚠️
+
+此文档的内容可能过于陈旧或者错误，请参考英文文档。
 
 {{< toc >}}