fix: adds --parallel option to help

src/Plugins/Help.php

@@ -102,6 +102,13 @@ final class Help implements HandlesArguments
             'desc' => 'Initialise a standard Pest configuration',
         ]], ...$content['Configuration']];
 
+        $content['Execution'] = [...[
+            [
+                'arg' => '--parallel',
+                'desc' => 'Run tests in parallel',
+            ],
+        ], ...$content['Execution']];
+
         $content['Selection'] = array_merge([
             [
                 'arg' => '--bail',

tests/.snapshots/help-command.txt

@@ -33,6 +33,7 @@
   --test-suffix [suffixes]  Only search for test in files with specified suffix(es). Default: Test.php,.phpt  
 
   EXECUTION OPTIONS:
+  --parallel ........................................... Run tests in parallel  
   --process-isolation ................ Run each test in a separate PHP process  
   --globals-backup ................. Backup and restore $GLOBALS for each test  
   --static-backup ......... Backup and restore static properties for each test