[ci] Add update-release-info command suggestion when version check fails

script/tool/lib/src/version_check_command.dart

@@ -547,20 +547,22 @@ ${indentation}The first version listed in CHANGELOG.md is $fromChangeLog.
       return null;
     }
 
+    bool missingVersionChange = false;
+    bool missingChangelogChange = false;
     if (state.needsVersionChange) {
       if (_prLabels.contains(_missingVersionChangeOverrideLabel)) {
         logWarning('Ignoring lack of version change due to the '
             '"$_missingVersionChangeOverrideLabel" label.');
       } else {
+        missingVersionChange = true;
         printError(
             'No version change found, but the change to this package could '
             'not be verified to be exempt\n'
             'from version changes according to repository policy.\n'
             'If this is a false positive, please comment in '
             'the PR to explain why the PR\n'
             'is exempt, and add (or ask your reviewer to add) the '
-            '"$_missingVersionChangeOverrideLabel" label.');
-        return 'Missing version change';
+            '"$_missingVersionChangeOverrideLabel" label.\n');
       }
     }
 
@@ -569,18 +571,32 @@ ${indentation}The first version listed in CHANGELOG.md is $fromChangeLog.
         logWarning('Ignoring lack of CHANGELOG update due to the '
             '"$_missingChangelogChangeOverrideLabel" label.');
       } else {
+        missingChangelogChange = true;
         printError('No CHANGELOG change found.\n'
             'If this PR needs an exemption from the standard policy of listing '
             'all changes in the CHANGELOG,\n'
             'comment in the PR to explain why the PR is exempt, and add (or '
             'ask your reviewer to add) the\n'
             '"$_missingChangelogChangeOverrideLabel" label.\n'
             'Otherwise, please add a NEXT entry in the CHANGELOG as described in '
-            'the contributing guide.');
-        return 'Missing CHANGELOG change';
+            'the contributing guide.\n');
       }
     }
 
+    if (missingVersionChange && missingChangelogChange) {
+      printError('If this PR is not exempt, you can update version and '
+          'CHANGELOG with the "update-release-info" command.\\\n'
+          'See here for an example: '
+          'https://github.com/flutter/packages/blob/main/script/tool/README.md#update-changelog-and-version\\\n'
+          'For more details on versioning, check the contributing guide.');
+    }
+    if (missingVersionChange) {
+      return 'Missing version change';
+    }
+    if (missingChangelogChange) {
+      return 'Missing CHANGELOG change';
+    }
+
     return null;
   }
 }

script/tool/test/version_check_command_test.dart

@@ -787,8 +787,8 @@ void main() {
       });
 
       test(
-          'fails if a version change is missing from a change that does not '
-          'pass the exemption check', () async {
+          'fails if a version and CHANGELOG change is missing from a change '
+          'that does not pass the exemption check', () async {
         final RepositoryPackage plugin =
             createFakePlugin('plugin', packagesDir, version: '1.0.0');
 
@@ -819,6 +819,8 @@ packages/plugin/lib/plugin.dart
           output,
           containsAllInOrder(<Matcher>[
             contains('No version change found'),
+            contains('No CHANGELOG change found.'),
+            contains('"update-release-info" command'),
             contains('plugin:\n'
                 '    Missing version change'),
           ]),