tidy: support ignore-tidy for Markdown files

To be used to skip the `tab` check in `jobserver.md`.

Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: ojeda

src/tools/tidy/src/style.rs

@@ -178,6 +178,7 @@ fn contains_ignore_directive(can_contain: bool, contents: &str, check: &str) ->
     if contents.contains(&format!("// ignore-tidy-{check}"))
         || contents.contains(&format!("# ignore-tidy-{check}"))
         || contents.contains(&format!("/* ignore-tidy-{check} */"))
+        || contents.contains(&format!("<!-- ignore-tidy-{check} -->"))
     {
         Directive::Ignore(false)
     } else {
@@ -305,7 +306,8 @@ pub fn check(path: &Path, bad: &mut bool) {
 
         let can_contain = contents.contains("// ignore-tidy-")
             || contents.contains("# ignore-tidy-")
-            || contents.contains("/* ignore-tidy-");
+            || contents.contains("/* ignore-tidy-")
+            || contents.contains("<!-- ignore-tidy-");
         // Enable testing ICE's that require specific (untidy)
         // file formats easily eg. `issue-1234-ignore-tidy.rs`
         if filename.contains("ignore-tidy") {