update docs for running 'pub token' (#3602)

diff --git a/lib/src/command/lish.dart b/lib/src/command/lish.dart
index e516168..115f6a9 100644
--- a/lib/src/command/lish.dart
+++ b/lib/src/command/lish.dart

@@ -10,6 +10,7 @@
 import '../ascii_tree.dart' as tree;
 import '../authentication/client.dart';
 import '../command.dart';
+import '../command_runner.dart';
 import '../exceptions.dart' show DataException;
 import '../exit_codes.dart' as exit_codes;
 import '../http.dart';
@@ -126,12 +127,12 @@
       if (error.statusCode == 401) {
         msg += '$host package repository requested authentication!\n'
             'You can provide credentials using:\n'
-            '    pub token add $host\n';
+            '    $topLevelProgram pub token add $host\n';
       }
       if (error.statusCode == 403) {
         msg += 'Insufficient permissions to the resource at the $host '
             'package repository.\nYou can modify credentials using:\n'
-            '    pub token add $host\n';
+            '    $topLevelProgram pub token add $host\n';
       }
       if (error.serverMessage != null) {
         msg += '\n${error.serverMessage!}\n';

diff --git a/lib/src/source/hosted.dart b/lib/src/source/hosted.dart
index 0def1ed..4c366d5 100644
--- a/lib/src/source/hosted.dart
+++ b/lib/src/source/hosted.dart

@@ -1137,12 +1137,12 @@
       if (error.statusCode == 401) {
         hint = '$hostedUrl package repository requested authentication!\n'
             'You can provide credentials using:\n'
-            '    pub token add $hostedUrl';
+            '    dart pub token add $hostedUrl';
       }
       if (error.statusCode == 403) {
         hint = 'Insufficient permissions to the resource at the $hostedUrl '
             'package repository.\nYou can modify credentials using:\n'
-            '    pub token add $hostedUrl';
+            '    dart pub token add $hostedUrl';
         message = 'authorization failed';
       }
 

diff --git a/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/401-with-message.txt b/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/401-with-message.txt
index 8dcaaf5..61985a1 100644
--- a/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/401-with-message.txt
+++ b/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/401-with-message.txt

@@ -7,7 +7,7 @@
 [STDERR] 
 [STDERR] http://localhost:$PORT package repository requested authentication!
 [STDERR] You can provide credentials using:
-[STDERR]     pub token add http://localhost:$PORT
+[STDERR]     dart pub token add http://localhost:$PORT
 [STDERR] <message>
 [EXIT CODE] 69
 

diff --git a/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/401.txt b/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/401.txt
index 68d5bd0..d6f0005 100644
--- a/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/401.txt
+++ b/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/401.txt

@@ -7,6 +7,6 @@
 [STDERR] 
 [STDERR] http://localhost:$PORT package repository requested authentication!
 [STDERR] You can provide credentials using:
-[STDERR]     pub token add http://localhost:$PORT
+[STDERR]     dart pub token add http://localhost:$PORT
 [EXIT CODE] 69
 

diff --git a/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/403-with-message.txt b/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/403-with-message.txt
index 882660c..55363f5 100644
--- a/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/403-with-message.txt
+++ b/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/403-with-message.txt

@@ -7,7 +7,7 @@
 [STDERR] 
 [STDERR] Insufficient permissions to the resource at the http://localhost:$PORT package repository.
 [STDERR] You can modify credentials using:
-[STDERR]     pub token add http://localhost:$PORT
+[STDERR]     dart pub token add http://localhost:$PORT
 [STDERR] <message>
 [EXIT CODE] 69
 

diff --git a/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/403.txt b/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/403.txt
index f8a5af9..67ff232 100644
--- a/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/403.txt
+++ b/test/testdata/goldens/hosted/fail_gracefully_on_bad_version_listing_response_test/403.txt

@@ -7,6 +7,6 @@
 [STDERR] 
 [STDERR] Insufficient permissions to the resource at the http://localhost:$PORT package repository.
 [STDERR] You can modify credentials using:
-[STDERR]     pub token add http://localhost:$PORT
+[STDERR]     dart pub token add http://localhost:$PORT
 [EXIT CODE] 69