Fixup app.example.ini for task section, which is now queue.task (#30555) (#30562)

Backport #30555 by xor-gate

Config section `[task]` has been deprecated in favor of `[queue.task]`

Co-authored-by: Jerry Jacobs <xor-gate@users.noreply.github.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

docs/content/administration/config-cheat-sheet.en-us.md

@@ -1182,14 +1182,6 @@ in this mapping or the filetype using heuristics.
 
 - `DEFAULT_UI_LOCATION`: Default location of time on the UI, so that we can display correct user's time on UI. i.e. Asia/Shanghai
 
-## Task (`task`)
-
-Task queue configuration has been moved to `queue.task`. However, the below configuration values are kept for backwards compatibility:
-
-- `QUEUE_TYPE`: **channel**: Task queue type, could be `channel` or `redis`.
-- `QUEUE_LENGTH`: **1000**: Task queue length, available only when `QUEUE_TYPE` is `channel`.
-- `QUEUE_CONN_STR`: **redis://127.0.0.1:6379/0**: Task queue connection string, available only when `QUEUE_TYPE` is `redis`. If redis needs a password, use `redis://123@127.0.0.1:6379/0` or `redis+cluster://123@127.0.0.1:6379/0`.
-
 ## Migrations (`migrations`)
 
 - `MAX_ATTEMPTS`: **3**: Max attempts per http/https request on migrations.

docs/content/administration/config-cheat-sheet.zh-cn.md

@@ -1127,15 +1127,6 @@ ALLOW_DATA_URI_IMAGES = true
 
 - `DEFAULT_UI_LOCATION`：在 UI 上的默认时间位置，以便我们可以在 UI 上显示正确的用户时间。例如：Asia/Shanghai
 
-## 任务 (`task`)
-
-任务队列配置已移动到 `queue.task`。然而，以下配置值仍保留以确保向后兼容：
-
-- `QUEUE_TYPE`：**channel**：任务队列类型，可以是 `channel` 或 `redis`。
-- `QUEUE_LENGTH`：**1000**：任务队列长度，仅在 `QUEUE_TYPE` 为 `channel` 时可用。
-- `QUEUE_CONN_STR`：**redis://127.0.0.1:6379/0**：任务队列连接字符串，仅在 `QUEUE_TYPE` 为 `redis` 时可用。
-  如果 redis 需要密码，使用 `redis://123@127.0.0.1:6379/0` 或 `redis+cluster://123@127.0.0.1:6379/0`。
-
 ## 迁移 (`migrations`)
 
 - `MAX_ATTEMPTS`：**3**：每次 http/https 请求的最大尝试次数（用于迁移）。