Merge pull request #902 from cakephp/improve-help

Minor improvement to help

Author: dereuromark

src/Command/BakeMigrationCommand.php

@@ -176,7 +176,7 @@ public function getOptionParser(): ConsoleOptionParser
 * The types are the abstract database column types in CakePHP.
 * The <warning>?</warning> value indicates if a column is nullable.
   e.x. <warning>role:string?</warning>.
-* Length option must be enclosed in <warning>[]</warning>, for example: <warning>name:string[100]</warning>.
+* Length option must be enclosed in <warning>[]</warning>, for example: <warning>name:string?[100]</warning>.
 * The <warning>index</warning> attribute can define the column as having a unique
   key with <warning>unique</warning> or a primary key with <warning>primary</warning>.