Update dartdoc to 0.37.0 (#70882)

dev/bots/docs.sh

@@ -20,7 +20,7 @@ function generate_docs() {
     # Install and activate dartdoc.
     # NOTE: When updating to a new dartdoc version, please also update
     # `dartdoc_options.yaml` to include newly introduced error and warning types.
-    "$PUB" global activate dartdoc 0.36.2
+    "$PUB" global activate dartdoc 0.37.0
 
     # This script generates a unified doc set, and creates
     # a custom index.html, placing everything into dev/docs/doc.

dev/tools/dartdoc.dart

@@ -188,6 +188,7 @@ Future<void> main(List<String> arguments) async {
     ].join(','),
     '--exclude',
     <String>[
+      'dart:io/network_policy.dart', // dart-lang/dartdoc#2437
       'package:Flutter/temp_doc.dart',
       'package:http/browser_client.dart',
       'package:intl/intl_browser.dart',