Update FLUTTER_NOLINT uses to include issue link (flutter#21921)

In an upcoming patch, we'll enable enforcement that all FLUTTER_NOLINT
comments include an issue link. This migrates the remaining uses to that
format.

Bug: flutter#68273

Author: cbracken

shell/platform/linux/fl_json_message_codec.cc

@@ -2,10 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// TODO(cbracken): lint disabled due to rapidjson null deref issue.
-// https://github.com/flutter/flutter/issues/65676
-// FLUTTER_NOLINT
-
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_json_message_codec.h"
 
 #include <gmodule.h>

shell/version/version.cc

@@ -1,7 +1,8 @@
 // Copyright 2013 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-// FLUTTER_NOLINT
+
+// FLUTTER_NOLINT: https://github.com/flutter/flutter/issues/68332
 
 #include "flutter/shell/version/version.h"
 

vulkan/vulkan_window.cc

@@ -1,7 +1,8 @@
 // Copyright 2013 The Flutter Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-// FLUTTER_NOLINT
+
+// FLUTTER_NOLINT: https://github.com/flutter/flutter/issues/68331
 
 #include "vulkan_window.h"