[ VM ] Updated standalone VM to display message about --disable-service-auth-codes when --help --verbose is provided.

Change-Id: I88d3215ccf567a8c965298b5c9c3f7604149e9f1
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/100264
Reviewed-by: Kevin Moore <kevmoo@google.com>
Commit-Queue: Ben Konyi <bkonyi@google.com>
diff --git a/runtime/bin/main_options.cc b/runtime/bin/main_options.cc
index 42fa0b5..0826fa1 100644
--- a/runtime/bin/main_options.cc
+++ b/runtime/bin/main_options.cc
@@ -192,9 +192,15 @@
 "  enables tracing of library and script loading\n"
 "\n"
 "--enable-vm-service[=<port>[/<bind-address>]]\n"
-"  enables the VM service and listens on specified port for connections\n"
+"  Enables the VM service and listens on specified port for connections\n"
 "  (default port number is 8181, default bind address is localhost).\n"
 "\n"
+"--disable-service-auth-codes\n"
+"  Disables the requirement for an authentication code to communicate with\n"
+"  the VM service. Authentication codes help protect against CSRF attacks,\n"
+"  so it is not recommended to disable them unless behind a firewall on a\n"
+"  secure device.\n"
+"\n"
 "--root-certs-file=<path>\n"
 "  The path to a file containing the trusted root certificates to use for\n"
 "  secure socket connections.\n"