Update config-cheat-sheet and app.ini.sample

Author: masudur-rahman

custom/conf/app.ini.sample

@@ -794,7 +794,7 @@ ENABLED = false
 TOKEN =
 
 [storage]
-; URL of Bucket where files, such as, attachments, avatars, etc. are stored
-; If unset, file://<AppWorkPath> is used to maintain backward compatibility
-; Consult https://gocloud.dev/howto/blob/ for URL format for various cloud providers
+; URL of bucket where files are stored (such as attachments, avatars, etc.).
+; If unset, `BUCKET_URL` defaults to `file:// <AppWorkPath>`.
+; Consult https://gocloud.dev/howto/blob for URL format for various cloud providers and their credential paths and env variables.
 BUCKET_URL =

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

@@ -509,7 +509,7 @@ Two special environment variables are passed to the render command:
 
 ## Storage (`storage`)
 
-- `BUCKET_URL`: URL of Bucket where files, such as, attachments, avatars, etc. are stored. If unset, file://<current_directory> is used to maintain backward compatibility. Consult https://gocloud.dev/howto/blob/ for URL format for various cloud providers.
+- `BUCKET_URL`: URL of bucket where files are stored (such as attachments, avatars, etc.). If unset, `BUCKET_URL` defaults to `file:// <AppWorkPath>`. Consult https://gocloud.dev/howto/blob for URL format for various cloud providers and their credential paths and env variables.
 
 ## Other (`other`)
 

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

@@ -241,6 +241,10 @@ IS_INPUT_FILE = false
 - `FORMAT`: 显示在界面上的时间格式。比如： RFC1123 或者 2006-01-02 15:04:05
 - `DEFAULT_UI_LOCATION`: 默认显示在界面上的时区，默认为本地时区。比如： Asia/Shanghai
 
+## Storage (`storage`)
+
+- `BUCKET_URL`: 存储文件的存储桶的URL（例如附件，头像等）. 如果未设置，`BUCKET_URL`默认为`file：// <AppWorkPath>`. 有关各种云提供商及其凭证路径和env变量的URL格式，请参阅https://gocloud.dev/howto/blob .
+
 ## Other (`other`)
 
 - `SHOW_FOOTER_BRANDING`: 为真则在页面底部显示Gitea的字样。