notice markdownlint is now packaged in debian

service/documentation.md

@@ -105,8 +105,8 @@ check with [codespell][].
 
 ### Markdown linting
 
-You can install [markdownlint][] using the upstream instructions, but
-anarcat prefers to run it under Docker, with a wrapper script like:
+You can install [markdownlint][] using the upstream instructions, or
+run it under docker with a following wrapper:
 
 [markdownlint]: https://github.com/markdownlint/markdownlint
 
@@ -117,6 +117,8 @@ anarcat prefers to run it under Docker, with a wrapper script like:
 Drop this somewhere in your path as `mdl` and it will behave just as
 if it was installed locally.
 
+Otherwise markdown lint ships with Debian 13 (trixie) and later.
+
 Then you should drop this in `.git/hooks/pre-commit` (if you want to
 enforce checks):