Fix comments

pkgs/markdown/dart_test.yaml

diff --git a/pkgs/markdown/dart_test.yaml b/pkgs/markdown/dart_test.yaml
index 423fa52..588b409 100644
--- a/pkgs/markdown/dart_test.yaml
+++ b/pkgs/markdown/dart_test.yaml
@@ -1,6 +1,6 @@
 tags:
-  crashtest:
-    skip: 'Only run crashtest tests manually with `dart test -P crashtest`'
+  crash_test:
+    skip: 'Only run crash_test tests manually with `dart test -P crash_test`'
     presets:
-      crashtest:
-        skip: false # Don't skip when running in -P crashtest
+      crash_test:
+        skip: false # Don't skip when running in -P crash_test

pkgs/markdown/test/crash_test.dart

diff --git a/pkgs/markdown/test/crash_test.dart b/pkgs/markdown/test/crash_test.dart
index b85cc97..13322c0 100644
--- a/pkgs/markdown/test/crash_test.dart
+++ b/pkgs/markdown/test/crash_test.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2022, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
@@ -79,15 +79,18 @@
           try {
             await TarReader.forEach(Stream.value(archive), (entry) async {
               if (entry.name.endsWith('.md')) {
-                late String str;
+                late String contents;
                 try {
                   final bytes = await http.ByteStream(entry.contents).toBytes();
-                  str = utf8.decode(bytes);
+                  contents = utf8.decode(bytes);
                 } on FormatException {
                   return; // ignore invalid utf8
                 }
                 try {
-                  markdownToHtml(str, extensionSet: ExtensionSet.gitHubWeb);
+                  markdownToHtml(
+                    contents,
+                    extensionSet: ExtensionSet.gitHubWeb,
+                  );
                 } catch (err, st) {
                   errors
                       .add('package:$package/${entry.name}, throws: $err\n$st');
@@ -117,6 +120,6 @@
       }
     },
     timeout: Timeout(Duration(hours: 1)),
-    tags: 'crashtest', // skipped by default, see: dart_test.yaml
+    tags: 'crash_test', // skipped by default, see: dart_test.yaml
   );
 }