Exclude fuchsia_remote_debug_protocol from dartdocs (#17724)

dev/tools/dartdoc.dart

diff --git a/dev/tools/dartdoc.dart b/dev/tools/dartdoc.dart
index fe026dd..b235ece 100644
--- a/dev/tools/dartdoc.dart
+++ b/dev/tools/dartdoc.dart
@@ -129,7 +129,7 @@
     '--header', 'survey.html',
     '--footer-text', 'lib/footer.html',
     '--exclude-packages',
-'analyzer,args,barback,cli_util,csslib,flutter_goldens,front_end,glob,html,http_multi_server,io,isolate,js,kernel,logging,mime,mockito,node_preamble,plugin,shelf,shelf_packages_handler,shelf_static,shelf_web_socket,utf,watcher,yaml',
+'analyzer,args,barback,cli_util,csslib,flutter_goldens,front_end,fuchsia_remote_debug_protocol,glob,html,http_multi_server,io,isolate,js,kernel,logging,mime,mockito,node_preamble,plugin,shelf,shelf_packages_handler,shelf_static,shelf_web_socket,utf,watcher,yaml',
     '--exclude',
   'package:Flutter/temp_doc.dart,package:http/browser_client.dart,package:intl/intl_browser.dart,package:matcher/mirror_matchers.dart,package:quiver/mirrors.dart,package:quiver/io.dart,package:vm_service_client/vm_service_client.dart,package:web_socket_channel/html.dart',
     '--favicon=favicon.ico',