test: correct test comment

This corrects a comment on the signal type used in the test.

PR-URL: #38095
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

Author: evanlucas

test/abort/test-signal-handler.js

@@ -17,7 +17,8 @@ if (process.argv[2] === 'child') {
   const child = spawnSync(process.execPath,
                           ['--expose-internals', __filename, 'child'],
                           { stdio: 'inherit' });
-  // FreeBSD and macOS use SIGILL for the kind of crash we're causing here.
+  // FreeBSD uses SIGILL for this kind of crash.
+  // macOS uses SIGILL or SIGTRAP (arm64) for this kind of crash.
   assert(child.signal === 'SIGSEGV' || child.signal === 'SIGILL' ||
           child.signal === 'SIGTRAP', `child.signal = ${child.signal}`);
 }