Update Asciidoc markup example with safe defaults (#24920)

The cheat sheet uses the `asciidoc` markup language to demonstrate how to set up third party markup renderers. The current example has the following issues: - It promotes a legacy tool that does not handle modern AsciiDoc specifications - It does not account for embedded preview renders - It has no safety restrictions By switching to `asciidoctor`, uses are suggested to utilize de facto/standard tooling for AsciiDoc. The `--embedded` parameter will strip out HTML tags that contain the document (such as `<html></html>`) which aren't necessary for the render, and actually end up as text in the document if left in. The `--safe-mode` parameter (of which there are several profiles) imposes [certain policies](https://docs.asciidoctor.org/asciidoctor/latest/safe-modes/) on the files it ingests and what the resulting output looks like. GitHub itself uses the `secure` profile (the highest), which can be a good starting point for those who are uncertain of what to do. By default, if no mode is specified when `asciidoctor` runs it defaults to `unsafe`, i.e. no safety guidelines at all.
go-gitea · May 25, 2023 · d7e669c · d7e669c
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diff --git a/docs/content/doc/administration/config-cheat-sheet.en-us.md b/docs/content/doc/administration/config-cheat-sheet.en-us.md
@@ -1118,7 +1118,7 @@ Gitea can support Markup using external tools. The example below will add a mark
 ENABLED = true
 NEED_POSTPROCESS = true
 FILE_EXTENSIONS = .adoc,.asciidoc
-RENDER_COMMAND = "asciidoc --out-file=- -"
+RENDER_COMMAND = "asciidoctor --embedded --safe-mode=secure --out-file=- -"
 IS_INPUT_FILE = false
 ```
 

diff --git a/docs/content/doc/administration/config-cheat-sheet.zh-cn.md b/docs/content/doc/administration/config-cheat-sheet.zh-cn.md
@@ -337,7 +337,7 @@ test01.xls: application/vnd.ms-excel; charset=binary
 ENABLED = false
 NEED_POSTPROCESS = true
 FILE_EXTENSIONS = .adoc,.asciidoc
-RENDER_COMMAND = "asciidoc --out-file=- -"
+RENDER_COMMAND = "asciidoctor --embedded --safe-mode=secure --out-file=- -"
 IS_INPUT_FILE = false
 ```