Help texts: updates based on reviews

Author: jrfnl

src/Util/Help.php

@@ -458,7 +458,7 @@ private function getAllOptions()
             ],
             'bootstrap'  => [
                 'argument'    => '--bootstrap=<bootstrap>',
-                'description' => 'Run the specified comma-separated file(s) before processing begins.',
+                'description' => 'Run the specified file(s) before processing begins. A list of files can be provided, separated by commas.',
             ],
             'cache'      => [
                 'argument'    => '--cache[=<cacheFile>]',